Kinetics and synthesis of Ag2O nanoparticles by calcination and γ-irradiation of silver acetate
Date
2016-03-23
Authors
Mahfouz, Refaat M.
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Abstract
Kinetic studies for the non-isothermal decomposition of unirradiated and γ-irradiated silver acetate with 103 kGy total γ-ray doses were carried out in air. The results showed that the decomposition proceeds in one major step in the temperature range of (180–270 °C) with the formation of Ag2O as solid residue. The non-isothermal data for un-irradiated and γ-irradiated silver acetate were analyzed using Flynn-Wall-Ozawa (FWO) and nonlinear Vyazovkin (VYZ) isoconversional methods. These free models on the investigated data showed a systematic dependence of Ea on γ indicating a simple decomposition process. No significant changes in the thermal decomposition behavior of silver acetate were recorded as a result of γ-irradiation. Calcinations of γ-irradiated silver acetate (CH3COOAg) at 200 °C for 2 hours only led to the formation of pure Ag2O monodispersed nanoparticles. X-ray diffraction, FTIR and SEM techniques were employed for characterization of the synthesized nanoparticles
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Keywords
non-isothermal decomposition , γ-irradiation , silver oxide , nanoparticles