Synthesis at a Low Temperature and Optical Properties of ZnO Nanorods

ZnO nanorods were grown on ITO conducting glass by the chemical solution deposition method (CBD) at a low temperature(90 ℃). The effects of different conditions, such as different molar concentration of zinc nitrate and reaction time, especially the substrates on morphologies and photoluminescence properties of ZnO nanorods were studied. The size of ZnO nanorods increased with molar concentration of zinc nitrate, and the nanorods with different aspect ratios also formed through tuning the reaction time when the molar concentration was 0.1 M. The length of nanorods increased significantly with the reaction time, but the thickness of the film deposited on the substrate only slightly increased. In addition, the nature of the substrate was found to have effect on the crystal structure and morphology of the resultant ZnO nanorods. Photoluminescence measurements showed that the nanorods grown on the Si substrate had a relatively stronger UV emission compared to that of the ITO conducting glass and bare glass.