Thermoreactivity of Sol-Gel Precursor for ZnO-Based Thin Films


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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 (sclarite 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 nonisothermal decomposition of solid precursors in the temperature range 170-250oC have been found.



Materials Science Forum (Volumes 514-516)

Edited by:

Paula Maria Vilarinho




V. Muşat et al., "Thermoreactivity of Sol-Gel Precursor for ZnO-Based Thin Films", Materials Science Forum, Vols. 514-516, pp. 73-77, 2006

Online since:

May 2006




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