Effect of Shells ZnO; SiO2 on SnO2 Hybrid Core-Shell Nanospheres and their Structural, Morphological and Magnetic Properties

Nanocrystalline SnO2 core and ZnO as well as SiO2 shells coated core shell nanoparticles have been successfully synthesized by co-precipitation method. The as prepared samples were characterized by X-ray diffraction, FTIR, UV-Visible absorption, PL, FESEM, HRTEM with EDX measurements. The X-ray analysis showed that the obtained SnO2 core with tetragonal rutile crystalline structure and the shell ZnO with hexagonal structure. FTIR result shows the functional groups present in the samples. The spherical morphology and the formation of the core-shell structures have been confirmed by FESEM and HRTEM measurements. The tunable optical features of core/shell nanoparticles were investigated with UV-Vis spectra and Photoluminescence (PL) studies. The observed PL spectra indicates the strong interfacial coupling between metal-oxides lead to the defects related emission bands with different intensity. From this investigation it can be concluded that the surface modification with different metal and insulating oxides strongly influences the optical properties of the semiconductor which enhance their potential applications towards optical devices fabrication.