Synthesis and Characterization of CdO–SnO_2 Nanocomposites Prepared by Hydrothermal Method

摘要

In this work,(1-x)CdO–x SnO_2 nanocomposites(B 0.15) have been synthesized via hydrothermal route. The structural study reveals that CdO nanostructures possess crystalline phase and cubic structure. The CdO–SnO_2 nanocomposites possess both cubic and orthorhombic structure with good crystallinity. The crystallite size in the nanocomposites was found to be in the range of 9.6–19.6 nm. Field emission scanning electronic microscopy and highresolution tunnelling microscopy analysis confirm the presence of both cubic and orthorhombic structures which is also confirmed from X-ray diffraction studies. Fourier transform infrared spectroscopy(FTIR) studies confirm that CdO–SnO_2 nanocomposites possess the characteristics band of both CdO and SnO_2 nanostructures. The UV–visible absorption studies confirm that the optical absorption band in CdO–SnO_2 nanocomposites possesses both blue and red shift as compared to that of CdO nanostructures. Photoluminescence spectroscopy studies reveal the appearance of strong emission peak at 513,469 and 369 nm corresponding to green, blue and violet emission spectrum, respectively, in CdO–SnO_2 nanocomposites.The FTIR studies confirm the presence of hydroxyl and water functional group due to atmospheric water vapours and chemical bonding in CdO and CdO–SnO_2 nanocomposites. Raman spectroscopy confirms the presence of Raman bands of both CdO and SnO_2 phases in the CdO–SnO_2 nanocomposites.