Growth temperature dependent properties of ZnO nanorod arrays on glass substrate prepared by wet chemical method

In this work, ZnO nanorod arrays were grown on glass substrate by the wet chemical method, and the effect of synthesis temperature on the properties was investigated. The grown nanorods were characterized by X-ray diffraction (XRD), field emission scanning electron microscopy (1-E,SEM), Raman and Photoluminescence (PL) measurements. XRD pattern showed that nanorod prepared at 80 degrees C and 90 degrees C has high crystallinity with wurtzite structure and orientated along the c-axis. However, nanorods were not formed at 60 degrees C and 70 degrees C due to less energy supply for the growth of the ZnO. 14E-SEM results showed that the morphology and the size of ZnO can be effectively controlled. In particular, as the temperature increased, diameter of the nanorod was increased while length decreased. Raman scattering spectra of ZnO nanorod arrays revealed the characteristic Er mode that is related to the vibration of oxygen atoms in the wurtzite ZnO. Room-temperature PL spectra of the ZnO nanorods revealed a near-band-edge (NBE) emission peak. The NBE (UV light emission) band at similar to 383 nm might be attributed to the recombination of free exciton. The narrow full-width at half-maximum (F'WHM) of the UV emission indicated that ZnO nanorods had high crystallinity. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.