Optics and Photonics Society of Iran

Abstract— Z In this study, ZnO nanopowder was grown by thermal chemical vapor deposition. The growth temperature as a key factor, was set to be 950, 900 and 860 ◦C and flow rate of O2 was kept at about 200 sccm during growth condition. The result showed that the growth temperature has significant effect on the yield of growth, structure and the quality of ZnO nanopowders. Surface morphology was characterized by scanning electron microscopy (SEM). Optical properties of ZnO nanostructures was evaluated by photoluminescence (PL) spectroscopy that indicated a UV emission peak at 380 nm and another peak at about 500 nm. The optical absorption property of synthesized nanostructures was characterized by UV-visible spectrophotometer that showed by increasing growth temperature, the absorption in UV region was decreased. Moreover, X-ray diffraction (XRD) showed the hexagonal wurtzite structure of ZnO with (002) crystal plane as the preferred orientation.