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Ribeiro, Celso, Pedro Brogueira, Guilherme Lavareda, Carlos Nunes de Carvalho, Ana Amaral, Luis Santos, Jorge Morgado, Ulrich Scherf, and Vasco D. B. Bonifacio. "Ultrasensitive microchip sensor based on boron-containing polyfluorene nanofilms." BIOSENSORS & BIOELECTRONICS 26 (2010): 1662-1665. Abstract

A fluorene-based pi-conjugated copolymer with on-chain dibenzoborole units was used in the development of a nanocoated gold interdigitated microelectrode array device which successfully detects fluoride in a broad range of concentrations (10(-11)-10(-4) M) in aqueous solution, upon impedance spectroscopy measurements. A calibration curve obtained over this range of concentrations and a new analytical method based on impedance spectroscopy measurements in aqueous solution is proposed. The sensor nanofilm was produced by spin-coating and diagnosed via spectroscopic ellipsometry, AFM, and electrically conductivity techniques. Changes in the conductivity due to the boron-fluoride complex formation seem to be the major mechanism behind the dependence of impedimetric results on the fluoride concentration. (C) 2010 Elsevier B.V. All rights reserved.