Preparation and characterization of nano structured SnS2 by solid state reaction method

摘要

Nanometer sized SnS2 flakes were prepared by solid state reaction between tin chloride and thiourea in air at 275°C. The structural and optical properties of the resultant products were characterized by means of X-ray diffraction (XRD), scanning electron microscopy with energy dispersive spectroscopy (SEM with EDS), atomic force microscopy (AFM), UV-Vis absorption and photoluminescence spectroscopy. The X-ray diffraction (XRD) pattern of the as-prepared sample was indexed to the hexagonal phase of SnS2 and the crystallite size was found to be 21.12nm. Energy dispersive X-ray analysis indicated that the elemental ratio was close to those for tin disulphide (SnS2.04). The blue shift in the absorption edge was observed from the UV-Vis spectrum and the band gap was found to be 3.03eV. The Photoluminescence spectra showed two strong peaks corresponding to green and red emission.