effect of concentration and thermal treatment on the properties of sol-gel derived cuo/sio2 nanostructure

Authors

sayed hossein tohidi

garnik grigoryan

verzhine sarkeziyan

farhood ziaie

abstract

various concentrations of copper are embedded into silica matrix to xerogel form using copper source - cu(no3)2∙3h2o. 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 h2o/teos to be 6.2. 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 1, 2 and 5 wt% (samples a, b and c respectively). after ambient drying, the gel samples are heated from 60 to 1000˚c at a slow heating rate (50°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.

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