Preparation and Characterisation of ZnO - SiO2 and Bi2O3 – CuO Nanocomposites

In the present work, ZnO - SiO2 and Bi2O3– CuO nanocomposites have been prepared by sol gel with alternate precursors existing in literature. They are characterised by XRD, SEM,UV, FTIR and photoluminescence  spectra .The XRD results indicate a crystallite size of  approximately 80 nm for both nanocomposites. SEM image shows a heterogeneous particle size for both samples. The band gap of ZnO - SiO2 and Bi2O3– CuO obtained from Taucs plot is 4.1 eV and 2.85 eV, respectively. PL spectra show high intensity absorption for ZnO-SiO2 in comparison to   Bi2O3–CuO. The composites of Bi2O3–CuO is recommended for efficient optical coating against the coating made from Bi2O3.