Effect of Concentration and Thermal Treatment on the Properties of Sol-Gel Derived CuO/SiO۲ Nanostructure

Various concentrations of copper are embedded into silica matrix to xerogel form using copper source - Cu(NO۳)۲∙۳H۲O. The xerogel samples are prepared by hydrolysis and condensation of tetraethyl orthosilicate (TEOS) by the sol-gel method  and with determination of new molar ratio of components H۲O/TEOS to be ۶.۲. In this investigation, the necessary amount of trihydrated copper nitrate is added to the solution in such a manner that the concentration of the copper oxide in final solution reach to ۱, ۲ and ۵ wt% (samples A, B and C respectively). After ambient drying, the gel samples are heated from ۶۰ to ۱۰۰۰˚C at a slow heating rate (۵۰°C/h). The absorption and transmittance spectrum of  various concentrations of copper are studied by Uv-vis spectrophotometer. Thermal treatment effects are characterized by FTIR, TGA, TEM, SEM, XRD, BET and TPR methods at different temperatures.

کلیدواژه ها:

Copper oxide ، Nanocomposite ، Concentration ، Thermal treatment ، silica