@article {Coelho2023, title = {{Paper-based laser-induced graphene for sustainable and flexible microsupercapacitor applications}}, journal = {Microchimica Acta}, volume = {190}, number = {1}, year = {2023}, note = {n/a}, pages = {1{\textendash}10}, abstract = {

Laser-induced graphene (LIG) is as a promising material for flexible microsupercapacitors (MSCs) due to its simple and cost-effective processing. However, LIG-MSC research and production has been centered on non-sustainable polymeric substrates, such as polyimide. In this work, it is presented a cost-effective, reproducible, and robust approach for the preparation of LIG structures via a one-step laser direct writing on chromatography paper. The developed strategy relies on soaking the paper in a 0.1~M sodium tetraborate solution (borax) prior to the laser processing. Borax acts as a fire-retardant agent, thus allowing the laser processing of sensitive substrates that other way would be easily destroyed under the high-energy beam. LIG on paper exhibiting low sheet resistance (30 ${\O}mega$ sq-1) and improved electrode/electrolyte interface was obtained by the proposed method. When used as microsupercapacitor electrodes, this laser-induced graphene resulted in specific capacitances of 4.6 mF cm-2 (0.015~mA~cm-2). Furthermore, the devices exhibit excellent cycling stability (\> 10,000 cycles at 0.5~mA~cm-2) and good mechanical properties. By connecting the devices in series and parallel, it was also possible to control the voltage and energy delivered by the system. Thus, paper-based LIG-MSC can be used as energy storage devices for flexible, low-cost, and portable electronics. Additionally, due to their flexible design and architecture, they can be easily adapted to other circuits and applications with different power requirements. Graphical Abstract: [Figure not available: see fulltext.]

}, keywords = {Flexible devices, Laser-induced graphene, Microsupercapacitors, paper electronics, Sustainable production methods}, isbn = {0123456789}, issn = {14365073}, doi = {10.1007/s00604-022-05610-0}, author = {Coelho, Jo{\~a}o and Correia, Ricardo F. and Silvestre, Sara and Pinheiro, Tom{\'a}s and Marques, Ana C. and Correia, M. Ros{\'a}rio P. and Pinto, Joana Vaz and Fortunato, Elvira and Martins, Rodrigo} } @article {Pinheiro2023, title = {{Parylene-Sealed Perovskite Nanocrystals Down-Shifting Layer for Luminescent Spectral Matching in Thin Film Photovoltaics}}, year = {2023}, note = {n/a}, abstract = {n/a}, author = {Pinheiro, Ana and Ruivo, Andreia and Ferro, Marta and Pinto, Joana Vaz and Deuermeier, Jonas and Mateus, Tiago and Santa, Ana and Mendes, Manuel J and Martins, Rodrigo and Gago, Sandra and Laia, C A T and Hugo, {\'A}} } @article {Correia2022, title = {{Biocompatible Parylene-C Laser-Induced Graphene Electrodes for Microsupercapacitor Applications}}, journal = {ACS Applied Materials {\&} Interfaces}, volume = {14}, number = {41}, year = {2022}, note = {n/a}, month = {oct}, pages = {46427{\textendash}46438}, publisher = {American Chemical Society}, abstract = {n/a}, issn = {1944-8244}, doi = {10.1021/acsami.2c09667}, url = {https://doi.org/10.1021/acsami.2c09667}, author = {Correia, Ricardo and Deuermeier, Jonas and Correia, Maria Ros{\'a}rio and {Vaz Pinto}, Joana and Coelho, Jo{\~a}o and Fortunato, Elvira and Martins, Rodrigo} } @article {Silva2022, title = {{Sputtering Deposition of TiO2 Thin Film Coatings for Fiber Optic Sensors}}, journal = {Photonics}, volume = {9}, number = {5}, year = {2022}, note = {n/a}, month = {may}, pages = {342}, publisher = {MDPI AG}, abstract = {

Thin films of titanium dioxide (TiO2) and titanium (Ti) were deposited onto glass and optical fiber supports through DC magnetron sputtering, and their transmission was characterized with regard to their use in optical fiber-based sensors. Deposition parameters such as oxygen partial pressure, working pressure, and sputtering power were optimized to attain films with a high reflectance. The films deposited on glass supports were characterized by UV-Vis spectroscopy, X-ray diffraction (XRD), and scanning electron microscopy (SEM). Regarding the deposition parameters, all three parameters were tested simultaneously, changing the working pressure, the sputtering power, and the oxygen percentage. It was possible to conclude that a lower working pressure and higher applied power lead to films with a higher reflectance. Through the analysis of the as-sputtered thin films using X-ray diffraction, the deposition of both Ti and TiO2 films was confirmed. To study the applicability of TiO2 and Ti in fiber sensing, several thin films were deposited in single mode fibers (SMFs) using the sputtering conditions that revealed the most promising results in the glass supports. The sputtered TiO2 and Ti thin films were used as mirrors to increase the visibility of a low-finesse Fabry{\textendash}Perot cavity and the possible sensing applications were studied.

}, doi = {10.3390/photonics9050342}, author = {Silva, Daniela and Monteiro, Catarina S. and Silva, Susana O. and Fraz{\~a}o, Orlando and Pinto, Joana V. and Raposo, Maria and Ribeiro, Paulo A and S{\'e}rio, Susana} } @article {Firmino2022, title = {{Solution Combustion Synthesis of Hafnium-Doped Indium Oxide Thin Films for Transparent Conductors}}, journal = {Nanomaterials}, volume = {12}, number = {13}, year = {2022}, note = {n/a}, month = {jun}, pages = {2167}, abstract = {

{\textless}p{\textgreater}Indium oxide (In2O3)-based transparent conducting oxides (TCOs) have been widely used and studied for a variety of applications, such as optoelectronic devices. However, some of the more promising dopants (zirconium, hafnium, and tantalum) for this oxide have not received much attention, as studies have mainly focused on tin and zinc, and even fewer have been explored by solution processes. This work focuses on developing solution-combustion-processed hafnium (Hf)-doped In2O3 thin films and evaluating different annealing parameters on TCO{\textquoteright}s properties using a low environmental impact solvent. Optimized TCOs were achieved for 0.5 M{\%} Hf-doped In2O3 when produced at 400 {\textdegree}C, showing high transparency in the visible range of the spectrum, a bulk resistivity of 5.73 {\texttimes} 10-2 ${\O}mega$.cm, a mobility of 6.65 cm2/V.s, and a carrier concentration of 1.72 {\texttimes} 1019 cm-3. Then, these results were improved by using rapid thermal annealing (RTA) for 10 min at 600 {\textdegree}C, reaching a bulk resistivity of 3.95 {\texttimes} 10 -3 ${\O}mega$.cm, a mobility of 21 cm2/V.s, and a carrier concentration of 7.98 {\texttimes} 1019 cm-3, in air. The present work brings solution-based TCOs a step closer to low-cost optoelectronic applications.{\textless}/p{\textgreater}

}, issn = {2079-4991}, doi = {10.3390/nano12132167}, url = {https://www.mdpi.com/2079-4991/12/13/2167}, author = {Firmino, Rita and Carlos, Emanuel and Pinto, Joana Vaz and Deuermeier, Jonas and Martins, Rodrigo and Fortunato, Elvira and Barquinha, Pedro and Branquinho, Rita} } @article {Centeno2020, title = {{Self-Cleaned Photonic-Enhanced Solar Cells with Nanostructured Parylene-C}}, volume = {2000264}, year = {2020}, note = {n/a}, pages = {1{\textendash}9}, abstract = {

Abstract Photonic front-coatings with self-cleaning properties are presented as means to enhance the efficiency and outdoor performance of thin-film solar cells, via optical enhancement while simultaneously minimizing soiling-related losses. This is achieved by structuring parylene-C transparent encapsulants using a low-cost and highly-scalable colloidal-lithography methodology. As a result, superhydrophobic surfaces with broadband light-trapping properties are developed. The optimized parylene coatings show remarkably high water contact angles of up to 165.6{\textdegree} and extremely low adhesion, allowing effective surface self-cleaning. The controlled nano/micro-structuring of the surface features also generates strong anti-reflection and light scattering effects, corroborated by numeric electromagnetic modeling, which lead to pronounced photocurrent enhancement along the UV?vis?IR range. The impact of these photonic-structured encapsulants is demonstrated on nanocrystalline silicon solar cells, that show short-circuit current density gains of up to 23.6\%, relative to planar reference cells. Furthermore, the improvement of the devices{\textquoteright} angular response enables an enhancement of up to 35.2\% in the average daily power generation.

}, doi = {10.1002/admi.202000264}, author = {Centeno, Pedro and Alexandre, Miguel F. and Chapa, Manuel and Pinto, Joana V. and Deuermeier, Jonas and Mateus, Tiago and Fortunato, Elvira and Martins, Rodrigo and {\'A}guas, Hugo and Mendes, Manuel J} } @article {Otero2017, title = {{Barium, zinc and strontium yellows in late 19th-early 20th century oil paintings}}, journal = {Heritage Science}, volume = {5}, number = {1}, year = {2017}, note = {n/a}, abstract = {

{\textcopyright} 2017 The Author(s). This work focuses on the study of the 19th century yellow chromate pigments based on barium (BaCrO4), zinc (4ZnCrO4K2O3H2O) and strontium (SrCrO4). These pigments, which are reported to shift in hue and darken, have been found in 19th century artworks. A better understanding of their historic manufacture will contribute to the visual/chemical interpretation of change in these colours. Research was carried out on the Winsor \& Newton (W\&N) 19th century archive database providing a unique insight into their manufacturing processes. One hundred and three production records were found, 69\% for barium, 25\% for zinc and 6\% for strontium chromates, mainly under the names Lemon, Citron and Strontian Yellow, respectively. Analysis of the records shows that each pigment is characterised by only one synthetic pathway. The low number of records found for the production of strontium chromate suggests W\&N was not selling this pigment formulation on a large scale. Furthermore, contrary to what the authors have discovered for W\&N chrome yellow pigments, extenders were not added to these pigment formulations, most probably due to their lower tinting strength (TS). The latter was calculated in comparison to pure chrome yellow (PbCrO4, 100\% TS) resulting in 92\% for barium, 65\% for zinc potassium and 78\% for strontium chromate pigments. This indicates that W\&N was probably using extenders primarily to adjust pigment properties and not necessarily as a means to reduce their costs. Pigment reconstructions following the main methods of synthesis were characterised by complementary analytical techniques: Fibre optic reflectance spectroscopy, X-ray diffraction, micro-Raman and micro-Fourier transform infrared spectroscopies. These pigments can be clearly distinguished on the basis of their infrared CrO42-asymmetric stretching fingerprint profile (between 1000 and 700 cm-1) and of their Raman CrO42-stretching bands (850-950 cm-1). This enabled their identification in historic paint samples: a tube of late 19th century W\&N Lemon Yellow oil paint and micro-samples from paintings by three Portuguese painters, Ant{\'o}nio Silva Porto (1850-1893), Jo{\~a}o Marques de Oliveira (1853-1927) and Amadeo de Souza-Cardoso (1887-1918). The good correlation found between the reconstructions and historic samples validates their use as reference materials for future photochemical studies.

}, keywords = {$μ$-FTIR, $μ$-Raman, 19th century paintings, Barium yellow, FORS, Reconstructions, Strontium yellow, Winsor \& Newton archive, XRD, Zinc yellow}, issn = {20507445}, doi = {10.1186/s40494-017-0160-3}, author = {Otero, V. and Campos, M.F. and Pinto, JV and Vilarigues, M and Carlyle, L. and Melo, M. J.} } @article {Otero2017123, title = {{Nineteenth century chrome yellow and chrome deep from Winsor \& NewtonTM}}, journal = {Studies in Conservation}, volume = {62}, number = {3}, year = {2017}, note = {n/a}, pages = {123{\textendash}149}, abstract = {

The Winsor \& NewtonTM (W\&N) nineteenth century archive database includes digitised images of hand- written instructions and workshop notes for the manufacture of their artists{\textquoteright} materials. For the first time, all 183 production records for yellow lead chromate pigments were studied and evaluated. They revealed that W\&N produced essentially three pigment types: lemon/pale based on mixed crystals of lead chromate and lead sulphate [Pb(Cr,S)O4]; middle on pure monoclinic lead chromate [PbCrO4]; and deep that contains the latter admixed with basic lead chromate [Pb2CrO5]; accounting for 53, 22, and 21\% of the production, respectively. Production records for primrose (4\%) were also included since the formulation results in mixed crystals with a high percentage of lead sulphate, which, according to the literature, leaves it more prone to degradation. Each pigment type is characterised by only one or two main synthetic pathways; process variations reveal a systematic and thorough search for a high-quality durable product. A comparison of the chemical composition of pigment reconstructions with early W\&N oil paint tubes showed that their records entitled {\textquoteleft}pale{\textquoteright} and {\textquoteleft}lemon{\textquoteright} correlated with the pigment in their tube labelled chrome yellow and, {\textquoteleft}middle{\textquoteright} and {\textquoteleft}deep{\textquoteright} with the label chrome deep. Lemon and middle pigment formulations were made into oil paints to assess their relative photo-stability. The degradation process was followed by colorimetry and was studied by synchrotron radiation-based techniques. Based on the X-ray absorption spectroscopy data, the possibility for creating a stability index for chrome yellows is discussed. Keywords:

}, keywords = {Chrome yellow, Lead chromate, Newton TM, Reconstructions, Synchrotron radiation (SR)-based techniques, Winsor \&, X-ray absorption near-edge microspectroscopy ({\textmu}-XA, {\textmu}-Fourier-transform infrared spectroscopy ({\textmu}-FTIR)}, issn = {20470584}, doi = {10.1080/00393630.2015.1131478}, url = {https://www.scopus.com/inward/record.uri?eid=2-s2.0-84978539212\&doi=10.1080\%2F00393630.2015.1131478\&partnerID=40\&md5=def3595385b4dcea18e2b60a1698a914 http://dx.doi.org/10.1080/00393630.2015.1131478}, author = {Otero, V. and Pinto, J.V. V and Carlyle, L. and Vilarigues, M and Cotte, M. and Melo, M.J. J} } @article {Pardal2017, title = {{Syngas production by electrochemical CO2 reduction in an ionic liquid based-electrolyte}}, journal = {Journal of CO2 Utilization}, volume = {18}, year = {2017}, note = {n/a}, abstract = {

{\textcopyright} 2017 Elsevier Ltd. Graphical abstract: The electrochemical reduction of carbon dioxide dissolved in a solution of water and ionic liquid as electrolyte, at high-pressure and near room-temperature, is reported. This work describes an electro-deposition strategy for the preparation of copper substrate cathodes, coated with bimetallic zinc-copper films, obtained from deep-eutectic solvents plating baths. The prepared bimetallic cathodes showed electrochemical activity for syngas production in 1-butyl-3-methylimidazolium triflate, with yields of 85N$μ$L (normal microliter)cm-2C-1/170N$μ$Lcm-2h-1, high selectivities, tunable H2/CO ratio and low energetic requirements.

}, keywords = {Carbon dioxide, Copper-zinc alloys, Electroreduction, ionic liquids, Syngas}, issn = {22129820}, doi = {10.1016/j.jcou.2017.01.007}, author = {Pardal, T. and Messias, S. and Sousa, M. and Machado, A.S.R. and Rangel, C.M. and Nunes, D. and Pinto, JV and Martins, R. and {Da Ponte}, M.N.} } @article {Goswami2017, title = {{{\textquotedblleft}Electro-Typing{\textquotedblright} on a Carbon-Nanoparticles-Filled Polymeric Film using Conducting Atomic Force Microscopy}}, journal = {Advanced Materials}, volume = {29}, number = {47}, year = {2017}, note = {n/a}, abstract = {

{\textcopyright} 2017 WILEY-VCH Verlag GmbH \& Co. KGaA, Weinheim. Next-generation electrical nanoimprinting of a polymeric data sheet based on charge trapping phenomena is reported here. Carbon nanoparticles (CNPs) (waste carbon product) are deployed into a polymeric matrix (polyaniline) (PANI) as a charge trapping layer. The data are recorded on the CNPs-filled polyaniline device layer by {\textquotedblleft}electro-typing{\textquotedblright} under a voltage pulse (VET, from {\textpm}1 to {\textpm}7 V), which is applied to the device layer through a localized charge-injection method. The core idea of this device is to make an electrical image through the charge trapping mechanism, which can be {\textquotedblleft}read{\textquotedblright} further by the subsequent electrical mapping. The density of stored charges at the carbon{\textendash}polyaniline layer, near the metal/polymer interface, is found to depend on the voltage amplitude, i.e., the number of injected charge carriers. The relaxation of the stored charges is studied by different probe voltages and for different devices, depending on the percolation of the CNPs into the PANI. The polymeric data sheet retains the recorded data for more than 6 h, which can be refreshed or erased at will. Also, a write{\textendash}read{\textendash}erase{\textendash}read cycle is performed for the smallest {\textquotedblleft}bit{\textquotedblright} of stored information through a single contact between the probe and the device layer.

}, keywords = {carbon nanoparticles, charge trapping, conducting atomic force microscopy, CV, polymer composites}, issn = {15214095}, doi = {10.1002/adma.201703079}, author = {Goswami, S. and Nandy, S. and Banerjee, A.N. and Kiazadeh, A. and Dillip, G.R. and Pinto, JV and Joo, S.W. and Martins, R. and Fortunato, E.} } @article {Kardarian2016, title = {{Effect of Mg doping on Cu2O thin films and their behavior on the TiO2/Cu2O heterojunction solar cells}}, journal = {Solar Energy Materials and Solar Cells}, volume = {147}, year = {2016}, note = {n/a}, month = {apr}, pages = {27{\textendash}36}, abstract = {

Abstract The present work shows the effect of magnesium doping on structural, optoelectrical and electrical properties of Cu2O thin films prepared by spray pyrolysis. The variation in the concentration of Mg shows significant impact on the final thin film properties, whereas the film doped with 0.5 at{\%} of Mg exhibited major property improvements in comparison with the undoped thin film and among the other concentrations tested. This condition was further applied for the deposition of an absorber layer in a heterojunction solar cell array with a gradient in thicknesses of active layers to investigate the impact of changing thicknesses on the PV parameters of the solar cell. TiO2 was used as a window layer and the 0.5 at{\%} Cu2O doped film as an absorber layer. The produced heterojunction solar cell array was further exposed to a rapid thermal annealing treatment. The I{\textendash}V measurements show an open circuit voltage of up to 365 mV and a short circuit current density, which is dependent on absorber layer thickness, and reaches to a maximum value of 0.9 mA/cm2.

}, keywords = {Cuprous oxide, Heterojunction, Magnesium doping, Metal oxide semiconductors, Photoconductivity, Solar cells}, issn = {0927-0248}, doi = {http://dx.doi.org/10.1016/j.solmat.2015.11.041}, url = {http://www.sciencedirect.com/science/article/pii/S0927024815006340}, author = {Kardarian, Kasra and Nunes, Daniela and {Maria Sberna}, Paolo and Ginsburg, Adam and Keller, David A. and {Vaz Pinto}, Joana and Deuermeier, Jonas and Anderson, Assaf Y. and Zaban, Arie and Martins, Rodrigo and Fortunato, Elvira} } @article {10984, title = {Smart optically active VO nanostructured layers applied in roof-type ceramic tiles for energy efficiency}, journal = {Solar Energy Materials \& Solar Cells}, volume = {150}, year = {2016}, pages = {1-9}, author = {A Gon{\c c}alves and J. Resende and Marques, A C and Pinto, JV and Nunes, D. and A. Marie and R. Gon{\c c}alves and Pereira, L. and Martins, R. and Fortunato, E.} } @article {Nunes2016, title = {{Photocatalytic behavior of TiO2 films synthesized by microwave irradiation}}, journal = {Catalysis Today}, volume = {278}, year = {2016}, note = {n/a}, abstract = {

{\textcopyright} 2015 Elsevier B.V. Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.

}, keywords = {Microwave irradiation, Nanorod arrays, Photocatalysis, Rutile structure, Seed layer, TiO 2}, issn = {09205861}, doi = {10.1016/j.cattod.2015.10.038}, author = {Nunes, D. and Pimentel, A. and Pinto, JV and Calmeiro, T.R. and Nandy, S. and Barquinha, P. and Pereira, L. and Carvalho, P. A. and Fortunato, E. and Martins, R.} } @article {Morais2015, title = {{Imidazole: Prospect Solvent for Lignocellulosic Biomass Fractionation and Delignification}}, journal = {ACS Sustainable Chemistry {\&} Engineering}, year = {2015}, note = {n/a}, month = {dec}, publisher = {American Chemical Society}, abstract = {n/a}, doi = {10.1021/acssuschemeng.5b01600}, url = {http://dx.doi.org/10.1021/acssuschemeng.5b01600}, author = {Morais, Ana Rita C and Pinto, Joana Vaz and Nunes, Daniela and Roseiro, Lu{\'\i}sa B and Oliveira, Maria Concei{\c c}{\~a}o and Fortunato, Elvira and Bogel-{\L}ukasik, Rafa{\l}} } @article {10832, title = {Photocatalytic behavior of TiO2 films synthesized by microwave irradiation}, journal = {Catalysis Today}, year = {2015}, note = {n/a}, month = {2015}, abstract = {

Titanium dioxide was synthesized on glass substrates from titanium (IV)isopropoxide and hydrochloride acid aqueous solutions through microwave irradiation using as seed layer either fluorine-doped crystalline tin oxide (SnO2:F) or amorphous tin oxide (a-SnOx). Three routes have been followed with distinct outcome: (i) equimolar hydrochloride acid/water proportions (1HCl:1water) resulted in nanorod arrays for both seed layers; (ii) higher water proportion (1HCl:3water) originated denser films with growth yield dependent on the seed layer employed; while (iii) higher acid proportion (3HCl:1water) hindered the formation of TiO2. X-ray diffraction (XRD) showed that the materials crystallized with the rutile structure, possibly with minute fractions of brookite and/or anatase. XRD peak inversions observed for the materials synthesized on crystalline seeds pointed to preferred crystallographic orientation. Electron diffraction showed that the especially strong XRD peak inversions observed for TiO2 grown from the 1HCl:3water solution on SnO2:F originated from a [001] fiber texture. Transmittance spectrophotometry showed that the materials with finer structure exhibited significantly higher optical band gaps. Photocatalytic activity was assessed from methylene blue degradation, with the 1HCl:3water SnO2:F material showing remarkable degradability performance, attributed to a higher exposure of (001) facets, together with stability and reusability.

}, keywords = {Microwave irradiation, Nanorod arrays, Photocatalysis, Rutile structure, Seed layer, TiO2}, isbn = {0920-5861}, url = {http://www.sciencedirect.com/science/article/pii/S0920586115007063}, author = {Nunes, D. and Pimentel, A. and Pinto, JV and Calmeiro, T.R. and Nandy, S. and Barquinha, P. and Pereira, L. and Carvalho, P. A. and Fortunato, E. and Martins, R.} } @article {10833, title = {Room Temperature Synthesis of Cu2O Nanospheres: Optical Properties and Thermal Behavior}, journal = {Microscopy and Microanalysis}, volume = {21}, year = {2015}, note = {n/a}, month = {2015}, pages = {11}, abstract = {

The present work reports a simple and easy wet chemistry synthesis of cuprous oxide (Cu2O) nanospheres at room temperature without surfactants and using different precursors. Structural characterization was carried out by X-ray diffraction, transmission electron microscopy, and scanning electron microscopy coupled with focused ion beam and energy-dispersive X-ray spectroscopy. The optical band gaps were determined from diffuse reflectance spectroscopy. The photoluminescence behavior of the as-synthesized nanospheres showed significant differences depending on the precursors used. The Cu2O nanospheres were constituted by aggregates of nanocrystals, in which an on/off emission behavior of each individual nanocrystal was identified during transmission electron microscopy observations. The thermal behavior of the Cu2O nanospheres was investigated with in situ X-ray diffraction and differential scanning calorimetry experiments. Remarkable structural differences were observed for the nanospheres annealed in air, which turned into hollow spherical structures surrounded by outsized nanocrystals. FAU - Nunes, Daniela

}, author = {Nunes, D. and Santos, L and Duarte, P and Pimentel, A. and Pinto, JV and Barquinha, P. and Carvalho, P. A. and Fortunato, E. and Martins, R.} } @article {10843, title = {Structure and Morphologic Influence of WO3 Nanoparticles on the Electrochromic Performance of Dual-Phase a-WO3/WO3 Inkjet Printed Films}, journal = {Advanced Electronic Materials}, year = {2015}, note = {n/a}, month = {2015}, pages = {n/a-n/a}, abstract = {

The optimization of tungsten trioxide (WO3) nanoparticles produced via hydrothermal synthesis for application in electrochromic (EC) devices is reported. The structure and morphology of the nanoparticles are controlled by changing the acidity of the aqueous solvent added to the sol-gel precursor (peroxopolytungstic acid) during synthesis. Orthorhombic hydrated WO3 nanorods or monoclinic WO3 nanoslabs are obtained when HCl is added, while synthesis only in aqueous medium results in a mixture of both types of polymorphs. Dual-phase thin films are processed by inkjet printing deposition of the nanoparticles in flexible polyethylene terephthalate substrate with indium tin oxide coating (ITO PET) followed by the deposition of the precursor solution. When compared with purely amorphous tungsten oxide films, the dual phase ones present higher optical densities and improved capacity, and cyclability stability. The best results, obtained for orthorhombic hydrated nanoparticles (ortho-WO3{\textperiodcentered}0.33H2O), are due to its high surface area and improved conductivity. Additionally, the ex situ X-ray diffraction (XRD) lithiation studies show evidence of a higher distortion of the monoclinic when compared with the orthorhombic crystallographic structure, which contribute to the inferior EC performance. These results validate the use of inkjet printing deposition with low processing temperatures for EC dual-phase thin films containing optimized nanoparticles which are compatible with low-cost substrates.

}, keywords = {electrochromic materials, hydrothermal synthesis, inkjet printing, nanoparticles, tungsten oxides}, isbn = {2199-160X}, url = {http://dx.doi.org/10.1002/aelm.201400002}, author = {Santos, L{\'\i}dia and Wojcik, Pawel and Pinto, Joana V. and Elangovan, Elamurugu and Viegas, Jaime and Pereira, Lu{\'I}s and Martins, Rodrigo and Fortunato, Elvira} } @article {Nunes2015a, title = {{Charging effects and surface potential variations of Cu-based nanowires}}, journal = {Thin Solid Films}, year = {2015}, note = {n/a}, pages = {1{\textendash}9}, publisher = {Elsevier B.V.}, abstract = {

The presentwork reports charging effects and surface potential variations in pure copper, cuprous oxide and cu- pric oxide nanowires observed by electrostatic force microscopy (EFM) and Kelvin probe force microscopy (KPFM). The copper nanowires were produced by wet synthesis, oxidation into cuprous oxide nanowires was achieved throughmicrowave irradiation and cupric oxide nanowireswere obtained via furnace annealing in at- mospheric conditions. Structural characterization of the nanowireswas carried out byX-ray diffraction, scanning electron microscopy, transmission electron microscopy and energy dispersive X-ray spectroscopy. During the EFM experiments the electrostatic field of the positive probe charged negatively the Cu-based nanowires, which in turn polarized the SiO2 dielectric substrate. Both the probe/nanowire capacitance as well as the sub- strate polarization increased with the applied bias. Cu2O and CuO nanowires behaved distinctively during the EFMmeasurements in accordancewith their band gap energies. Thework functions(WF) of the Cu-based nano- wires, obtained by KPFM measurements, yieldedWFCuO N WFCu N WFCu2O

}, keywords = {Capacitive effects, charge mapping, Cu-based nanowires, Dielectric polarization, Electrostatic force microscopy, Kelvin probe force microscopy}, issn = {0040-6090}, doi = {10.1016/j.tsf.2015.11.077}, url = {http://dx.doi.org/10.1016/j.tsf.2015.11.077}, author = {Nunes, D. and Calmeiro, T.R. and Nandy, S. and Pinto, JV and Pimentel, A. and Barquinha, P. and Carvalho, P. A. and Walmsley, J C and Fortunato, E. and Martins, R.} } @article {Kiazadeh2015, title = {{Operational stability of solution based zinc tin oxide/SiO2 thin film transistors under gate bias stress}}, journal = {APL Materials}, volume = {3}, number = {6}, year = {2015}, note = {n/a}, pages = {062804}, abstract = {

In this study, we report solution-processed amorphous zinc tin oxide transistors exhibiting high operational stability under positive gate bias stress, translated by a recoverable threshold voltage shift of about 20{\%} of total applied stress voltage. Under vacuum condition, the threshold voltage shift saturates showing that the gate-bias stress is limited by trap exhaustion or balance between trap filling and emptying mechanism. In ambient atmosphere, the threshold voltage shift no longer saturates, stability is degraded and the recovering process is impeded. We suggest that the trapping time during the stress and detrapping time in recovering are affected by oxygen adsorption/desorption processes. The time constants extracted from stretched exponential fitting curves are ≈106 s and 105 s in vacuum and air, respectively.

}, issn = {2166-532X}, doi = {10.1063/1.4919057}, url = {http://scitation.aip.org/content/aip/journal/aplmater/3/6/10.1063/1.4919057}, author = {Kiazadeh, Asal and Salgueiro, Daniela and Branquinho, Rita and Pinto, Joana and Gomes, Henrique L. and Barquinha, Pedro and Martins, Rodrigo and Fortunato, Elvira} } @article {Nunes2015, title = {{Photocatalytic behavior of TiO2 films synthesized by microwave irradiation}}, journal = {Catalysis Today}, year = {2015}, note = {n/a}, publisher = {Elsevier B.V.}, abstract = {n/a}, issn = {09205861}, doi = {10.1016/j.cattod.2015.10.038}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0920586115007063}, author = {Nunes, D. and Pimentel, A. and Pinto, JV and Calmeiro, T.R. and Nandy, S. and Barquinha, P. and Pereira, L. and Carvalho, P. A. and Fortunato, E. and Martins, R.} } @article {Miguel2014210, title = {{The alchemy of red mercury sulphide: The production of vermilion for medieval art}}, journal = {Dyes and Pigments}, volume = {102}, year = {2014}, note = {n/a}, month = {mar}, pages = {210{\textendash}217}, publisher = {Elsevier Ltd}, abstract = {

abstract Vermilion red, mercury sulphide (a-HgS), was one of the most important reds in art and its use as a pigment dates back to Antiquity. In medieval Europe, it could be mined as cinnabar, or produced as vermilion by heating mercury with sulphur. This work aims to study the production of synthetic vermilion as a medieval pigment and to confirm which was the source (mineral or artificial) of the reds used in Portuguese medieval illuminations. The production of synthetic vermilion was based on the process described in the Judaeo-Portuguese medieval treatise {\textquotedblleft}The book on how to make colours{\textquotedblright}, using materials and technologies as close as possible to the medieval ones. The reaction mechanism was studied by following the heating process by X-ray diffraction, and it was possible to conclude that the transformation from black cubic b-HgS into red hexagonal a-HgS is a solid-state phase transition, occurring at 235 ?C. This result is contrary to what published in technical art literature, in which this process is described as a sublimation. Moreover, Scanning Electron Microscopy evidenced a sinterization effect on the artificial vermilion, not found in medieval original samples nor in paints prepared with mineral cinnabar from Almad{\'e}n (Spain). Red mercury sulphide, natural and synthetic,was then prepared as a parchment-glue paint and compared to proteinaceous red paints from 12the13th century minia- tures produced in important medieval monasteries, previously fully characterized by a multi-analytical approach (m-Energy dispersive X-ray fluorescence, m-Fourier Transform Infrared Spectroscopy, Raman microscopy). A comparative Electron probe microanalysis of the red paints point to amineral provenance for medieval vermilion found in Portuguese illuminations

}, issn = {01437208}, doi = {10.1016/j.dyepig.2013.10.041}, url = {http://linkinghub.elsevier.com/retrieve/pii/S0143720813004221 https://www.scopus.com/inward/record.uri?eid=2-s2.0-84888118306\&doi=10.1016\%2Fj.dyepig.2013.10.041\&partnerID=40\&md5=73ca6019cb7911fc78e3b3cb4d54974a}, author = {Miguel, Catarina and Pinto, Joana V. and Clarke, Mark and Melo, Maria J.} } @article {10827, title = {The alchemy of red mercury sulphide: The production of vermilion for medieval art}, journal = {Dyes and Pigments}, volume = {102}, year = {2014}, note = {n/a}, month = {2014}, pages = {210-217}, abstract = {

Vermilion red, mercury sulphide (α-HgS), was one of the most important reds in art and its use as a pigment dates back to Antiquity. In medieval Europe, it could be mined as cinnabar, or produced as vermilion by heating mercury with sulphur. This work aims to study the production of synthetic vermilion as a medieval pigment and to confirm which was the source (mineral or artificial) of the reds used in Portuguese medieval illuminations. The production of synthetic vermilion was based on the process described in the Judaeo-Portuguese medieval treatise {\textquotedblleft}The book on how to make colours{\textquotedblright}, using materials and technologies as close as possible to the medieval ones. The reaction mechanism was studied by following the heating process by X-ray diffraction, and it was possible to conclude that the transformation from black cubic β-HgS into red hexagonal α-HgS is a solid-state phase transition, occurring at 235~{\textdegree}C. This result is contrary to what published in technical art literature, in which this process is described as a sublimation. Moreover, Scanning Electron Microscopy evidenced a sinterization effect on the artificial vermilion, not found in medieval original samples nor in paints prepared with mineral cinnabar from Almad{\'e}n (Spain). Red mercury sulphide, natural and synthetic, was then prepared as a parchment-glue paint and compared to proteinaceous red paints from 12th{\textendash}13th century miniatures produced in important medieval monasteries, previously fully characterized by a multi-analytical approach (μ-Energy dispersive X-ray fluorescence, μ-Fourier Transform Infrared Spectroscopy, Raman microscopy). A comparative Electron probe microanalysis of the red paints point to a mineral provenance for medieval vermilion found in Portuguese illuminations.

}, keywords = {Cinnabar, Historic pigment, Medieval colours, Medieval illuminations, Mercury sulphide, Vermilion}, isbn = {0143-7208}, url = {http://www.sciencedirect.com/science/article/pii/S0143720813004221}, author = {Miguel, Catarina and Pinto, Joana V. and Clarke, Mark and Melo, Maria J.} } @article {10834, title = {Electrochromic behavior of NiO thin films deposited by e-beam evaporation at room temperature}, journal = {Solar Energy Materials and Solar Cells}, volume = {120, Part A}, year = {2014}, note = {n/a}, month = {2014}, pages = {109-115}, abstract = {

In this work we report the role of thickness on electrochromic behavior of nickel oxide (NiO) films deposited by e-beam evaporation at room temperature on ITO-coated glass. The structure and morphology of films with thicknesses between 100 and 500 nm were analyzed and then correlated with electrochemical response and transmittance modulation when immersed in 0.5 M LiClO4{\textendash}PC electrolyte. The NiO exhibits an anodic coloration, reaching for the thickest film a transmittance modulation of 66\% between colored and bleached state, at 630 nm, with a color efficiency of 55 cm2 C-1. Very fast switch between states was obtained, where coloration and bleaching times are 3.6 s cm-2 and 1.4 s cm-2, respectively.

}, keywords = {Chromogenic materials, electrochromic devices, Nickel oxide, Thermal evaporation}, isbn = {0927-0248}, url = {http://www.sciencedirect.com/science/article/pii/S0927024813004315}, author = {Pereira, S{\'o}nia and Gon{\c c}alves, Alexandra and Correia, Nuno and Pinto, Joana and Pereira, Lu{\'I}s and Martins, Rodrigo and Fortunato, Elvira} } @article {10848, title = {Ion sensing (EIS) real-time quantitative monitorization of isothermal DNA amplification}, journal = {Biosensors and Bioelectronics}, year = {2014}, note = {

ORCID Reference type: [bibtex]; ORCID Reference: [@article{artins_Fortunato_Baptista_2013, title={Ion sensing (EIS) real-time quantitative monitorization of isothermal DNA amplification}, url={http://dx.doi.org/10.1016/j.bios.2013.08.029}, DOI={10.1016/j.bios.2013.08.029}, journal={Biosensors and Bioelectronics}, publisher={Elsevier }, author={Veigas, Bruno and Branquinho, Rita and Pinto, Joana V. and Wojcik, Pawel J. and Martins, Rodrigo and Fortunato, Elvira and Baptista, Pedro V.}, year={2013}, month={Aug}}]

}, month = {2014}, abstract = {n/a}, isbn = {0956-5663}, author = {Veigas, Bruno and Branquinho, Rita and Pinto, Joana V. and Wojcik, Pawel J. and Martins, Rodrigo and Fortunato, Elvira and Baptista, Pedro V.} } @article {10817, title = {PVA composite catalytic membranes for hyacinth flavour synthesis in a pervaporation membrane reactor}, journal = {Catalysis Today}, volume = {236}, year = {2014}, note = {n/a}, month = {2014}, pages = {98-107}, abstract = {n/a}, isbn = {0920-5861;1873-4308}, author = {Ceia, T. F. and Silva, A G and Ribeiro, C S and Pinto, JV and Casimiro, MH and Ramos, A. M. and Vital, J} } @article {Miguel2014, title = {{The alchemy of red mercury sulphide: The production of vermilion for medieval art}}, journal = {Dyes and Pigments}, volume = {102}, year = {2014}, note = {n/a}, abstract = {

Vermilion red, mercury sulphide ($\alpha$-HgS), was one of the most important reds in art and its use as a pigment dates back to Antiquity. In medieval Europe, it could be mined as cinnabar, or produced as vermilion by heating mercury with sulphur. This work aims to study the production of synthetic vermilion as a medieval pigment and to confirm which was the source (mineral or artificial) of the reds used in Portuguese medieval illuminations. The production of synthetic vermilion was based on the process described in the Judaeo-Portuguese medieval treatise "The book on how to make colours", using materials and technologies as close as possible to the medieval ones. The reaction mechanism was studied by following the heating process by X-ray diffraction, and it was possible to conclude that the transformation from black cubic $\beta$-HgS into red hexagonal $\alpha$-HgS is a solid-state phase transition, occurring at 235 C. This result is contrary to what published in technical art literature, in which this process is described as a sublimation. Moreover, Scanning Electron Microscopy evidenced a sinterization effect on the artificial vermilion, not found in medieval original samples nor in paints prepared with mineral cinnabar from Almad{\'e}n (Spain). Red mercury sulphide, natural and synthetic, was then prepared as a parchment-glue paint and compared to proteinaceous red paints from 12th-13th century miniatures produced in important medieval monasteries, previously fully characterized by a multi-analytical approach ($μ$-Energy dispersive X-ray fluorescence, $μ$-Fourier Transform Infrared Spectroscopy, Raman microscopy). A comparative Electron probe microanalysis of the red paints point to a mineral provenance for medieval vermilion found in Portuguese illuminations. {\textcopyright} 2013 Elsevier Ltd. All rights reserved.

}, keywords = {Cinnabar, Historic pigment, Medieval colours, Medieval illuminations, Mercury sulphide, Vermilion}, issn = {01437208}, doi = {10.1016/j.dyepig.2013.10.041}, author = {Miguel, C. and Pinto, JV and Clarke, M. and Melo, M. J.} } @article {10828, title = {Current transport mechanism at metal-semiconductor nanoscale interfaces based on ultrahigh density arrays of p-type NiO nano-pillars}, journal = {Nanoscale}, volume = {5}, year = {2013}, note = {n/a}, month = {2013}, pages = {11699-11709}, abstract = {

The present work focuses on a qualitative analysis of localised I-V characteristics based on the nanostructure morphology of highly dense arrays of p-type NiO nano-pillars (NiO-NPs). Vertically aligned NiO-NPs have been grown on different substrates by using a glancing angle deposition (GLAD) technique. The preferred orientation of as grown NiO-NPs was controlled by the deposition pressure. The NiO-NPs displayed a polar surface with a microscopic dipole moment along the (111) plane (Tasker{\textquoteright}s type III). Consequently, the crystal plane dependent surface electron accumulation layer and the lattice disorder at the grain boundary interface showed a non-uniform current distribution throughout the sample surface, demonstrated by a conducting AFM technique (c-AFM). The variation in I-V for different points in a single current distribution grain (CD-grain) has been attributed to the variation of Schottky barrier height (SBH) at the metal-semiconductor (M-S) interface. Furthermore, we observed that the strain produced during the NiO-NPs growth can modulate the SBH. Inbound strain acts as an external field to influence the local electric field at the M-S interface causing a variation in SBH with the NPs orientation. This paper shows that vertical arrays of NiO-NPs are potential candidates for nanoscale devices because they have a great impact on the local current transport mechanism due to its nanostructure morphology.

}, isbn = {2040-3364}, url = {http://dx.doi.org/10.1039/C3NR03803C}, author = {Nandy, Suman and Goncalves, Goncalo and Pinto, Joana Vaz and Busani, Tito and Figueiredo, Vitor and Pereira, Luis and Paiva Martins, Rodrigo Ferrao and Fortunato, Elvira} } @article {10839, title = {Extended-Gate ISFETs Based on Sputtered Amorphous Oxides}, journal = {Journal of Display Technology}, volume = {9}, year = {2013}, note = {

ORCID Reference type: [bibtex]; ORCID Reference: [@article{a_Alves_Martins_Fortunato_2013, title={Extended-Gate ISFETs Based on Sputtered Amorphous Oxides}, volume={9}, url={http://dx.doi.org/10.1109/JDT.2012.2227298}, DOI={10.1109/JDT.2012.2227298}, number={9}, journal={Journal of Display Technology}, publisher={Institute of Electrical and Electronics Engineers}, author={Pinto, Joana V. and Branquinho, Rita and Barquinha, Pedro and Alves, Eduardo and Martins, Rodrigo and Fortunato, Elvira}, year={2013}, month={Sep}, pages={729-734}}]

}, month = {2013}, pages = {729-734}, abstract = {n/a}, isbn = {1551-319X}, url = {://WOS:000324388100004}, author = {Pinto, Joana V. and Branquinho, Rita and Barquinha, Pedro and Alves, Eduardo and Martins, Rodrigo and Fortunato, Elvira} } @article {10825, title = {p-Type CuxO Thin-Film Transistors Produced by Thermal Oxidation}, journal = {Journal of Display Technology}, volume = {9}, year = {2013}, note = {

ORCID Reference type: [bibtex]; ORCID Reference: [@article{s_Alves_Martins_Fortunato_2013, title={p-Type ${\hbox{Cu}}_{x}{\hbox{O}}$ Thin-Film Transistors Produced by Thermal Oxidation}, url={http://dx.doi.org/10.1109/JDT.2013.2247025}, DOI={10.1109/JDT.2013.2247025}, journal={Journal of Display Technology}, publisher={Institute of Electrical and Electronics Engineers}, author={Figueiredo, V. and Pinto, J. V. and Deuermeier, J. and Barros, R. and Alves, E. and Martins, R. and Fortunato, E.}, year={2013}, pages={1-6}}]

}, month = {2013}, pages = {6}, abstract = {n/a}, isbn = {1551-319X}, url = {://WOS:000324392700001}, author = {Figueiredo, V. and Pinto, JV and Deuermeier, J and Barros, R. and E. Alves and Martins, R. and Fortunato, E.} } @article {10810, title = {Plastic Compatible Sputtered Ta2O5 Sensitive Layer for Oxide Semiconductor TFT Sensors}, journal = {Display Technology, Journal of}, volume = {9}, year = {2013}, note = {n/a}, month = {2013}, pages = {723-728}, abstract = {

The effect of post-deposition annealing temperature on the pH sensitivity of room temperature RF sputtered Ta2O5 was investigated. Structural and morphological features of these films were analyzed before and after annealing at various temperatures. The deposited films are amorphous up to 600 \&$\#$xB0;C and crystallize at 700 \&$\#$xB0;C in an orthorhombic phase. Electrolyte-insulator-semiconductor (EIS) field effect based sensors with an amorphous Ta2O5 sensing layer showed pH sensitivity above 50 mV/pH. For sensors annealed above 200 \&$\#$xB0;C pH sensitivity decreased with increasing temperature. Stabilized sensor response and maximum pH sensitivity was achieved after low temperature annealing at 200 \&$\#$xB0;C, which is compatible with the use of polymeric substrates and application as sensitive layer in oxides TFT-based sensors.

}, keywords = {amorphous semiconductors, amorphous sensing layer, Annealing, Biosensors, chemical sensors, deposited films, Dielectrics, EIS field effect based sensors, Electrolyte-insulator-semiconductor (eis) sensor, electrolyte-insulator-semiconductor field effect based sensor, field effect transistors, orthorhombic phase, oxide semiconductor TFT sensor, pH sensitivity, plastic compatible sputtered sensitive layer, polymeric substrates, post-deposition annealing temperature, Sensitivity, Sensor phenomena and characterization, sputtered ${hbox{Ta}}_{2}{hbox{O}}_{5}$ , stabilized sensor response, Surface morphology, Ta2O5, tantalum compounds, temperature 200 degC, temperature 293 K to 298 K, temperature annealing, Temperature sensors}, isbn = {1551-319X}, author = {Branquinho, R. and Pinto, JV and Busani, T. and Barquinha, P. and Pereira, L. and Viana Baptista, P. and Martins, R. and Fortunato, E.} } @article {10844, title = {Thermoelectric properties of V2O5 thin films deposited by thermal evaporation}, journal = {Applied Surface Science}, volume = {282}, year = {2013}, note = {

Times Cited: 0

}, month = {2013}, pages = {590-594}, abstract = {n/a}, isbn = {0169-4332}, url = {://WOS:000322314800088}, author = {Santos, R and Loureiro, J and Nogueira, A and Elangovan, E. and Pinto, JV and Veiga, JP and Busani, T. and Fortunato, E. and Martins, R. and Ferreira, I.} } @article {Cruz2013, title = {{Formation of oriented nickel aggregates in rutile single crystals by Ni implantation}}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {340}, year = {2013}, note = {n/a}, pages = {102{\textendash}108}, publisher = {Elsevier}, abstract = {

The magnetic and electrical properties of Ni implanted single crystalline TiO2 rutile were studied for nominal implanted fluences between 0.5?1017 cm-2 and 2.0?1017 cm-2 with 150 keV energy, corre- sponding to maximum atomic concentrations between 9 at{\%} and 27 at{\%} at 65 nm depth, in order to study the formation of metallic oriented aggregates. The results indicate that the as implanted crystals exhibit superparamagnetic behavior for the two higher fluences, which is attributed to the formation of nanosized nickel clusters with an average size related with the implanted concentration, while only paramagnetic behavior is observed for the lowest fluence. Annealing at 1073 K induces the aggregation of the implanted nickel and enhances the magnetization in all samples. The associated anisotropic behavior indicates preferred orientations of the nickel aggregates in the rutile lattice consistent with Rutherford backscattering spectrometry{\textemdash}channelling results. Electrical conductivity displays anisotropic behavior but no magnetoresistive effects were detected.

}, keywords = {Magnetic aggregate, Nickel nanoparticle, Titanium dioxide}, issn = {0304-8853}, doi = {10.1016/j.jmmm.2013.03.032}, url = {http://dx.doi.org/10.1016/j.jmmm.2013.03.032}, author = {Cruz, M M and Silva, R C and Pinto, JV and Borges, R P and N. Franco and Casaca, A} } @article {Figueiredo2013, title = {{p-Type Cu O Thin-Film Transistors Produced by Thermal Oxidation}}, journal = {Journal of Display Technology}, volume = {9}, number = {9}, year = {2013}, note = {n/a}, pages = {735{\textendash}740}, abstract = {

Thin-films of copper oxide Cu O were produced by thermal oxidation of metallic copper (Cu) at different tempera- tures (150{\textendash}450 C). The films produced at temperatures of 200, 250 and 300 C showed high Hall motilities of 2.2, 1.9 and 1.6 cm V s , respectively. Single Cu O phases were obtained at 200 Cand its conversion toCuO starts at 250 C. For lower thick- nesses 40 nm, the films oxidized at 250 Cshowed a complete conversion to CuO phase. Successful thin-film transistors (TFTs) were produce by thermal oxidation of a 20 nm Cu film, obtaining p-type Cu O (at 200 C) and CuO (at 250 C) with On/Off ratios of 6 10 and 1 10 , respectively.

}, keywords = {copper oxide, CuxO, p-type oxides, TFT, thermal oxidation, thin film transistors}, author = {Figueiredo, V. and Pinto, JV and Deuermeier, J and Barros, R. and E. Alves and Martins, R. and Fortunato, E.} } @article {Branquinho2013, title = {{Plastic Compatible Sputtered Ta O Sensitive Layer for Oxide Semiconductor TFT Sensors}}, journal = {Journal of Display Technology}, volume = {9}, number = {9}, year = {2013}, note = {n/a}, pages = {723{\textendash}728}, abstract = {

The effect of post-deposition annealing temperature on the pH sensitivity of room temperature RF sputtered Ta O was investigated. Structural and morphological features of these films were analyzed before and after annealing at various tem- peratures. The deposited films are amorphous up to 600 Cand crystallize at 700 C in an orthorhombic phase. Electrolyte-insu- lator-semiconductor (EIS) field effect based sensors with an amor- phousTa O sensing layer showed pHsensitivity above 50 mV/pH. For sensors annealed above 200 C pH sensitivity decreased with increasing temperature. Stabilized sensor response andmaximum pHsensitivitywas achieved after low temperature annealing at 200 C, which is compatible with the use of polymeric substrates and application as sensitive layer in oxides TFT-based sensors

}, keywords = {Biosensors, electrolyte-insulator-semiconductor EIS sensor, pH sensitivity, sputtered Ta2O5, sputtering, Ta2O5, TFT}, author = {Branquinho, Rita and Pinto, Joana V. and Busani, Tito and Barquinha, Pedro and Pereira, Luis and Baptista, Pedro Viana and Martins, Rodrigo and Fortunato, Elvira} } @article {10816, title = {Catalytic poly(vinyl alcohol) functionalized membranes obtained by gamma irradiation}, journal = {Radiation Physics and Chemistry}, volume = {81}, year = {2012}, note = {n/a}, month = {2012}, pages = {1314-1318}, abstract = {n/a}, isbn = {0969-806X}, author = {Casimiro, MH and Silva, A G and Pinto, JV and Ramos, A. M. and Vital, J and Ferreira, LM} } @article {10822, title = {DSM as a probe for the characterization of modified mesoporous silicas}, journal = {Microporous and Mesoporous Materials}, volume = {161}, year = {2012}, note = {n/a}, month = {2012}, pages = {139-147}, abstract = {n/a}, isbn = {1387-1811}, author = {Duarte, P and Ferreira, D. P. and Lopes, T. F. and Pinto, JV and Fonseca, I. M. and Ferreira Machado, I. and Vieira Ferreira, L. F.} } @article {Figueiredo2012, title = {{p-Type Cu x O Films Deposited at Room Temperature for Thin-Film Transistors}}, journal = {Journal of Display Technology}, volume = {8}, number = {1}, year = {2012}, note = {n/a}, pages = {41{\textendash}47}, abstract = {

Thin-films of copper oxide @Cu OA were sputtered from a metallic copper (Cu) target and studied as a function of oxygen partial pressure @O??A. A metallic Cu film with cubic structure obtained from 0{\%} O?? has been transformed to cubic CuPO phase for the increase in O?? to 9{\%} but then changed to monoclinic CuO phase (for O?? PS7). The variation in crystallite size (calculated from x-ray diffraction data) was further substantiated by the variation in grain size (surface microstruc- tures). The Cu O films produced with O?? ranging between 9{\%} and 75{\%} showed p-type behavior, which were successfully applied to produce thin-film transistors.

}, keywords = {copper oxide, CuxO, p-type oxides, sputtering, TFT}, author = {Figueiredo, V. and Elangovan, E. and Barros, R. and Pinto, JV and Busani, T. and Martins, R. and Fortunato, Elvira} } @article {10830, title = {Environmental, Optical, and Electrical Stability Study of Solution-Processed Zinc-Tin-Oxide Thin-Film Transistors}, journal = {Journal of Display Technology}, volume = {7}, year = {2011}, note = {n/a}, month = {2011}, pages = {640-643}, abstract = {n/a}, isbn = {1551-319X}, author = {Nayak, Pradipta K and Pinto, Joana V. and Goncalves, Goncalo and Martins, Rodrigo and Fortunato, Elvira} } @article {10811, title = {Real-time monitoring of PCR amplification of proto-oncogene c-MYC using a Ta2O5 electrolyte-insulator-semiconductor sensor}, journal = {Biosensors \& Bioelectronics}, volume = {28}, year = {2011}, note = {n/a}, month = {2011}, pages = {44-49}, abstract = {n/a}, isbn = {0956-5663}, author = {Branquinho, Rita and Veigas, Bruno and Pinto, Joana V. and Martins, Rodrigo and Fortunato, Elvira and Baptista, Pedro V.} } @article {10837, title = {Anisotropic ferromagnetism induced in rutile single crystals by Co implantation}, journal = {European Physical Journal B}, volume = {55}, year = {2007}, note = {

Times Cited: 9Casaca, Antonio/A-2859-2009; Physics Department, ISEL/F-6664-2010; Cruz, Maria Margarida/A-4926-2010

}, month = {2007}, pages = {253-260}, abstract = {n/a}, isbn = {1434-6028}, url = {://WOS:000244672600004}, author = {Pinto, JV and Cruz, M M and R. C. da Silva and N. Franco and Casaca, A and E. Alves and Godinho, M} } @article {10846, title = {Copper and cobalt nanocolloids in implanted MgO crystals}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {257}, year = {2007}, note = {

Times Cited: 415th International Conference on Ion Beam Modification of Materials
Sep 18-22, 2006
Taormina, ITALY
STMicroelect; IMM-CNR; MATIS CNR-INFM; Appl Mat; High Voltage Engn Europe; Axcelis; LPE-ETC; Hitec; Laser Source; 2M Strumenti; Varian; Univ Catania, Fac Sci

}, month = {2007}, pages = {563-567}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000246165500129}, author = {Savoini, B. and Gonzalez, R. and Pinto, JV and R. C. da Silva and E. Alves} } @article {10809, title = {Ferromagnetism in ZnO doped with Co by ion implantation}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {316}, year = {2007}, note = {

Times Cited: 16Joint European Magnetic Symposia (JEMS 06)
Jun 26-29, 2006
San Sebastian, SPAIN
Natl Advisory Comm
Goncalves, Antonio/B-2849-2008; Cruz, Maria Margarida/A-4926-2010

}, month = {2007}, pages = {E191-E194}, abstract = {n/a}, isbn = {0304-8853}, url = {://WOS:000248150000150}, author = {Borges, R P and Pinto, JV and R. C. da Silva and Goncalves, A. P. and Cruz, M M and Godinho, M} } @article {10820, title = {Relaxation behaviour of Co and Ni implanted into MgO}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {316}, year = {2007}, note = {

Times Cited: 4Joint European Magnetic Symposia (JEMS 06)
Jun 26-29, 2006
San Sebastian, SPAIN
Natl Advisory Comm
Cruz, Maria Margarida/A-4926-2010

}, month = {2007}, pages = {E776-E778}, abstract = {n/a}, isbn = {0304-8853}, url = {://WOS:000248150000309}, author = {Cruz, M M and Pinto, JV and R. C. da Silva and E. Alves and Gonzalez, R. and Godinho, M} } @article {10808, title = {Optical behaviour of Er doped rutile by ion implantation}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {250}, year = {2006}, note = {

Times Cited: 313th International Conference on Radiation Effects in Insulators (REI-2005)
Aug 28-sep 02, 2005
Santa Fe, NM
Los Alamos Natl Lab; Sandia Natl Labs; Pacific NW Natl Lab
Monteiro, Teresa/B-7466-2012; Universidade Aveiro, Departamento Fisica/E-4128-2013
Monteiro, Teresa/0000-0001-6945-2759;

}, month = {2006}, pages = {363-367}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000239883500073}, author = {E. Alves and Pinto, JV and R. C. da Silva and Peres, M. and Soares, M. J. and Monteiro, T.} } @article {10836, title = {Magnetic nanoscale aggregates of cobalt and nickel in MgO single crystals}, journal = {European Physical Journal B}, volume = {45}, year = {2005}, note = {

Times Cited: 12Cruz, Maria Margarida/A-4926-2010

}, month = {2005}, pages = {331-338}, abstract = {n/a}, isbn = {1434-6028}, url = {://WOS:000232038900007}, author = {Pinto, JV and Cruz, M M and R. C. da Silva and E. Alves and Gonzalez, R. and Godinho, M} } @article {10835, title = {Magnetic properties of TiO2 rutile implanted with Ni and Co}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {294}, year = {2005}, note = {

Times Cited: 13

}, month = {2005}, pages = {E73-E76}, abstract = {n/a}, isbn = {0304-8853}, url = {://WOS:000208671900015}, author = {Pinto, JV and Cruz, M M and R. C. da Silva and E. Alves and Godinho, M} } @article {10845, title = {Copper nanocolloids in MgO crystals implanted with Cu ions}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {218}, year = {2004}, note = {

Times Cited: 712th International Conference on Radiation Effects in Insulators
Aug 31-sep 05, 2003
Gramado, BRAZIL
UFRGS; FAPERGS; CNPQ; FINEP; Elsevier; High Voltage Engn Europa BV

}, month = {2004}, pages = {148-152}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000221561000024}, author = {Savoini, B. and Caceres, D. and Gonzalez, R. and Chen, Y. and Pinto, JV and R. C. da Silva and E. Alves} } @article {10847, title = {Electrical conductivity of as-grown and oxidized MgO : Li crystals implanted with Li ions}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {218}, year = {2004}, note = {

Times Cited: 412th International Conference on Radiation Effects in Insulators
Aug 31-sep 05, 2003
Gramado, BRAZIL
UFRGS; FAPERGS; CNPQ; FINEP; Elsevier; High Voltage Engn Europa BV

}, month = {2004}, pages = {164-169}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000221561000027}, author = {Tardio, M. and Ramirez, R. and Gonzalez, R. and Pinto, JV and R. C. da Silva and E. Alves and Chen, Y.} } @article {10819, title = {Magnetic behavior of Co and Ni implanted MgO}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {272}, year = {2004}, note = {

Times Cited: 6International Conference on Magnetism (ICM 2003)
Jul 27-aug 01, 2003
Rome, ITALY
Cruz, Maria Margarida/A-4926-2010

}, month = {2004}, pages = {840-842}, abstract = {n/a}, isbn = {0304-8853}, url = {://WOS:000222236700038}, author = {Cruz, M M and R. C. da Silva and Pinto, JV and Gonzalez, R. G. and E. Alves and Godinho, M} } @article {10838, title = {Stability and optical activity of Er implanted MgO}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {218}, year = {2004}, note = {

Times Cited: 112th International Conference on Radiation Effects in Insulators
Aug 31-sep 05, 2003
Gramado, BRAZIL
UFRGS; FAPERGS; CNPQ; FINEP; Elsevier; High Voltage Engn Europa BV
Monteiro, Teresa/B-7466-2012; Universidade Aveiro, Departamento Fisica/E-4128-2013
Monteiro, Teresa/0000-0001-6945-2759;

}, month = {2004}, pages = {128-132}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000221561000020}, author = {Pinto, JV and R. C. da Silva and E. Alves and Soares, M. J. and Monteiro, T. and Gonzalez, R.} } @article {10807, title = {Radiation-damage recovery in undoped and oxidized Li doped MgO crystals implanted with lithium ions}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {206}, year = {2003}, note = {

Times Cited: 613th International Conference on Ion Beam Modification of Materials
Sep 01-06, 2002
Kobe, japan
Monteiro, Teresa/B-7466-2012; Universidade Aveiro, Departamento Fisica/E-4128-2013
Monteiro, Teresa/0000-0001-6945-2759;

}, month = {2003}, pages = {148-152}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000183690500032}, author = {E. Alves and R. C. da Silva and Pinto, JV and Monteiro, T. and Savoini, B. and Caceres, D. and Gonzalez, R. and Chen, Y.} } @article {10841, title = {Enhanced electron screening in d(d, p)t for deuterated Ta}, journal = {European Physical Journal A}, volume = {13}, year = {2002}, note = {

Times Cited: 67Gyurky, Gyorgy/F-1078-2010; Fulop, Zsolt/B-2262-2008; Prada Moroni, Pier Giorgio/G-5565-2011; Aliotta, Marialuisa /H-2567-2012; Gyurky, Gyorgy/B-7254-2013

}, month = {2002}, pages = {377-382}, abstract = {n/a}, isbn = {1434-6001}, url = {://WOS:000175495400013}, author = {Raiola, F. and Migliardi, P. and Gyurky, G. and Aliotta, M. and Formicola, A. and Bonetti, R. and Broggini, C. and Campajola, L. and Corvisiero, P. and Costantini, H. and Cruz, J. and D{\textquoteright}Onofrio, A. and Fulop, Z. and Gervino, G. and Gialanella, L. and Guglielmetti, A. and Imbriani, G. and Gustavino, C. and Jesus, A P and Junker, M. and Kavanagh, R. W. and Moroni, P. G. P. and Ordine, A. and Pinto, JV and Prati, P. and Roca, V. and Ribeiro, J P and Rogalla, D. and Rolfs, C and Romano, M. and Schumann, F. and Schurmann, D. and Somorjai, E. and Strieder, F. and Terrasi, F. and Trautvetter, H. P. and Zavatarelli, S.} } @article {10814, title = {First measurement of the d(p, gamma)He-3 cross section down to the solar Gamow peak}, journal = {Nuclear Physics A}, volume = {706}, year = {2002}, note = {

Times Cited: 75Gyurky, Gyorgy/F-1078-2010; Fulop, Zsolt/B-2262-2008; Lemut, Alberto/G-8206-2012; Gyurky, Gyorgy/B-7254-2013

}, month = {2002}, pages = {203-216}, abstract = {n/a}, isbn = {0375-9474}, url = {://WOS:000176944700012}, author = {Casella, C. and Costantini, H. and Lemut, A. and Limata, B. and Bonetti, R. and Broggini, C. and Campajola, L. and Corvisiero, P. and Cruz, J. and D{\textquoteright}Onofrio, A. and Formicola, A. and Fulop, Z. and Gervino, G. and Gialanella, L. and Guglielmetti, A. and Gustavino, C. and Gyurky, G. and Imbriani, G. and Jesus, A P and Junker, M. and Ordine, A. and Pinto, JV and Prati, P. and Ribeiro, J P and Roca, V. and Rogalla, D. and Rolfs, C and Romano, M. and Rossi-Alvarez, C. and Scheumann, F. and Somorjai, E. and Straniero, O. and Strieder, F. and Terrasi, F. and Tratuvetter, H. P. and Zavatarelli, S. and Collaboration, Luna} } @article {10812, title = {A new setup for the underground study of capture reactions}, journal = {Nuclear Instruments \& Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment}, volume = {489}, year = {2002}, note = {

Times Cited: 30Gyurky, Gyorgy/F-1078-2010; vomiero, alberto/F-7567-2010; Fulop, Zsolt/B-2262-2008; Lemut, Alberto/G-8206-2012; Gyurky, Gyorgy/B-7254-2013; Bemmerer, Daniel/C-9092-2013
Bemmerer, Daniel/0000-0003-0470-8367

}, month = {2002}, pages = {160-169}, abstract = {n/a}, isbn = {0168-9002}, url = {://WOS:000177920500015}, author = {Casella, C. and Costantini, H. and Lemut, A. and Limata, B. and Bemmerer, D. and Bonetti, R. and Broggini, C. and Campajola, L. and Cocconi, P. and Corvisiero, P. and Cruz, J. and D{\textquoteright}Onofrio, A. and Formicola, A. and Fulop, Z. and Gervino, G. and Gialanella, L. and Guglielmetti, A. and Gustavino, C. and Gyurky, G. and Loiano, A. and Imbriani, G. and Jesus, A P and Junker, M. and Musico, P. and Ordine, A. and Parodi, F. and Parolin, M. and Pinto, JV and Prati, P. and Ribeiro, J P and Roca, V. and Rogalla, D. and Rolfs, C and Romano, M. and Rossi-Alvarez, C. and Rottura, A. and Schuemann, F. and Somorjai, E. and Strieder, F. and Terrasi, F. and Trautvetter, H. P. and Vomiero, A. and Zavatarelli, S.} } @article {10826, title = {Proton-induced gamma-ray analysis of lithium in thick samples}, journal = {Nuclear Instruments \& Methods in Physics Research Section B-Beam Interactions with Materials and Atoms}, volume = {190}, year = {2002}, note = {

Times Cited: 1015th International Conference on Ion-Beam Analysis (IBA-15)
Jul 15-20, 2001
Cairns, australia
Mateus, Rodrigo/A-4514-2013
Mateus, Rodrigo/0000-0001-6733-6359

}, month = {2002}, pages = {117-121}, abstract = {n/a}, isbn = {0168-583X}, url = {://WOS:000176108800021}, author = {R. Mateus and Jesus, A P and Braizinha, B. and Cruz, J. and Pinto, JV and Ribeiro, J P} } @article {Casella2002, title = {{A new setup for the underground study of capture reactions}}, journal = {Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment}, volume = {489}, year = {2002}, note = {n/a}, pages = {160{\textendash}169}, abstract = {

For the study of astrophysically relevant capture reactions in the underground laboratory LUNA a new setup of high sensitivity has been implemented. The setup includes a windowless gas target, a 4$π$ BGO summing crystal, and beam calorimeters. The setup has been recently used to measure the d(p,$\gamma$)3He cross-section for the first time within its solar Gamow peak, i.e. down to 2.5keV c.m. energy. The features of the optimized setup are described. {\textcopyright} 2002 Elsevier Science B.V. All rights reserved.

}, keywords = {160, 169, 2002, 489, a, a new setup for, b, bemmerer d, bonetti a, broggini e, c, campajola c, capture reactions, casella a, cocconi b, corvisiero b, costantini b, cruz f, d, h, in physics research a, j, l, lear instruments and methods, lemut b, limata c, onofrio g, p, r, the underground study of}, issn = {01689002}, doi = {10.1016/S0168-9002(02)00577-6}, author = {Casella, C. and Costantini, H. and Lemut, a. and Limata, B. and Bemmerer, D. and Bonetti, R. and Broggini, C. and Campajola, L. and Cocconi, P. and Corvisiero, P. and Cruz, J. and D{\textquoteright}Onofrio, a. and Formicola, a. and F{\"u}l{\"o}p, Z. and Gervino, G. and Gialanella, L. and Guglielmetti, a. and Gustavino, C. and Gyurky, G. and Loiano, a. and Imbriani, G. and Jesus, a. P. and Junker, M. and Musico, P. and Ordine, a. and Parodi, F. and Parolin, M. and Pinto, JV and Prati, P. and Ribeiro, J P and Roca, V. and Rogalla, D. and Rolfs, C and Romano, M. and Rossi-Alvarez, C. and Rottura, a. and Schuemann, F. and Somorjai, E. and Strieder, F. and Terrasi, F. and Trautvetter, H. P. and Vomiero, a. and Zavatarelli, S.} } @article {10842, title = {Experimental study of the F-19(p,alpha gamma)O-16 reaction}, journal = {Nuclear Physics A}, volume = {688}, year = {2001}, note = {

Times Cited: 06th International Conference on Nuclei in the Cosmos
Jun 27-jul 01, 2000
Univ aarhus, aarhus, denmark
Mateus, Rodrigo/A-4514-2013
Mateus, Rodrigo/0000-0001-6733-6359

}, month = {2001}, pages = {468C-471C}, abstract = {n/a}, isbn = {0375-9474}, url = {://WOS:000168799300102}, author = {Ribeiro, J P and Jesus, A P and Braizinha, B. and Cruz, J. and R. Mateus and Pinto, JV} }