1Material Research School, Nuclear Science and Technology Institute, P.O. Box 31485-498, Karaj, I.R. IRAN
2Yerevan State University, Yerevan 375049, ARMENIA
3Agricultural, Medical and Industrial Research School, Nuclear Science and Technology Institute, P.O. Box 31485-498, Karaj, I.R. IRAN
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.
 Sakka S., Kamiya K., Glasses from metal alcohlates, J. Non-Cryst. Solids., 42, p. 403 (1980).
 Livage J., Henry M., Sanchez C., Sol-Gel Chemistry of Transition Metal Oxides, Progr. Solid State Chem,18, p. 259 (1988).
 Hench H.H., West J.K., The Sol Gel Process,Chem. Rev 90, p. 33-72 (1990).
 Calderon-Guillen J.A., Aviles-Arellano L., M.Perez-Robles J.F., Gonzalez-Hernandez J., Dense Silica Based Coating Prepared from Colloidal Silica, J.Surface & Coating Technology,190, p. 110-114 (2005).
 Rolison D.R., Dunn B., Electrically Conductive Aerogels New Materials in Electrochemistry, J. Mater. Chem.11, p. 963-971 (2001).
 TsengI., Chang W., Wu C.S., Various Sol-Gel Procedures and Post-Tratments were Applied to Modify the Distribution of Cu, Appl. Catal. 203, p. 37 (2002).
 Karakassides M.A., Bourlions A., Petridis D., Synthesis and Characterization of Copper Containing Mesoporous Silica, J. Mater. Chem.10, p. 403 (2000).
 Mohanan J.L., Brock S.L., Sol-Gel Processing of Semiconducting Metal Xerogels, Chem. Mater.15, p. 2567 (2003).
 Parler C.M., Ritter J.A., Amiridis M.D., Infrared Spectroscopic Study of Sol Gel Derived Mixed Metal Oxides, J. Non-Cryst. Solids. 279, p. 119-125 (2001).
 Dutta A., Das D., Di Bartolomeo E., Traversa E., Chakravorty D., Preparation of Sol-Gel Nanocomposites Containing Copper Oxide and Their Gas Sensing Properties, Journal of Sol-Gel Science and Technology, 26, p. 1085 (2003).
 Sullivan J.A., Doherty J.A., NH3 and Urea in the Selective Catalytic Reduction of NOx Over Oxide-Supported Copper Catalyst, Applied Catalysis B: Environmental.55, p. 185 (2005).
 Perez-Robles J.F., Gonzales-Hernandez J., Charactrization of Sol-Gel Glasses with Different Copper Concentration Treated Under Oxidizing and Reducing Condition, J. Phys. Chem. Solids.60, p. 1729 (1999).
Martinez J.R., Palomares-Sanchez S., Ortega-Zarzosa G., Ruiz F., Chumukov Y., Rietveld Refinement of Amorphous SiO2 Prepared Via Sol-Gel Method, Materials Letters.60, p. 3526 (2006).
 De Sousa E.M.B., PortoA.O., Schilling P.J., Alves M.C.M., Mohallem N.D.S., J. Phys. Chem. Solids., 61, p. 853 (2000).
Martinez J.R., Ruiz F., Vorobiev Y.V., Gonzalez- Hernandez J., Infrared Spectroscopy Analysis of the Local Atomic Structure in Silica Prepared by Sol- Gel, J.Chem. Phys., 109, p. 7511 (1998).
Wang Z., liu Q., Yu J., Wu T., Wang G., Surface Structure and Catalytic Behavior of Silica Supported Copper Catalyst Prepared by Impregnation, Applied Catalysis A.,239, p. 87 (2003).
International Center for Diffraction Data, Inorganic Phases (1993).
Martinez J.R., Ruiz F., Vorobiev Y.V., Perez-Robles F., Gonzales-Hernandez J., J. Chem. Phys., 109, p. 754 (1998).
 Ruiz F., MartinezJ.R., Gonzalez-Hernandez J., Formation of Silicate Structures in Cu-Containing Silica, J. Mater. Res.15 (12), p. 2875 (2000).