Thermoreactivity of sol-gel precursor for ZnO-based thin films
- Citation:
- Muşat, V. a, P. b Vilarinho, R. c Monteiro, E. c Fortunato, and E. d Segal. "Thermoreactivity of sol-gel precursor for ZnO-based thin films." Materials Science Forum. 514-516 (2006): 73-77.
Abstract:
The thermoreactivity of a zinc acetate non-alkoxide solution used for the preparation of ZnO-based thin films was investigated in the temperature range 20-600°C by TG-DTA, XRD and SEM data. We found that the formation in air of ZnO crystallites from the sol-gel precursor occurs above 150°C simultaneously with the decomposition of an intermediary compound, most probably carbonate hydroxide (sciante and/or hydrozincite). At 200°C, the crystalline structure is well defined in terms of ZnO hexagonal lattice parameters, although residual organic compounds and water were not yet fully removed and an amorphous phase coexists. A kinetic investigation on the thermal decomposition of sol-gel precursor from DTA data using Kissinger differential equation is also presented. Apparent activation energy values of about. 100 kJ mol-1 corresponding to the non-isothermal decomposition of solid precursors in the temperature range 170-250°C have been found.
Notes:
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