Abstract: ZnO nanorods were prepared from zinc nitrate hexahydrate and PVA by hydrothermal method . The characterizations of ZnO nanorods were carried out by X-ray diffraction ( XRD ) and scan electron microscope (SEM).Absorption of nanorods was measured by UV-Vis spectra.The results show that the ZnO nanostructures are rod-like crystal of hexagonal wurtzite structure .The length of ZnO nanorods increase from 400 nm to 2 μm with increasing the PVA concentrations .The absorption spectra show that the optical band gap red shift with increase PVA concentration .

Key words: ZnO nanorods were prepared from zinc nitrate hexahydrate and PVA by hydrothermal method . The characterizations of ZnO nanorods were carried out by X-ray diffraction ( XRD ) and scan electron microscope (SEM).Absorption of nanorods was measured by UV-Vis spectra.The results show that the ZnO nanostructures are rod-like crystal of hexagonal wurtzite structure .The length of ZnO nanorods increase from 400 nm to 2 μm with increasing the PVA concentrations .The absorption spectra show that the optical band gap red shift with increase PVA concentration .