Synthesis And Optical Properties Of Fe-Doped Znic Oxide Nanostructures From A Layered Double Hydroxides Precursor

Zinc oxide (ZnO) is recognized as one of the most important semiconductor materials due to its direct wide band gap(3.37eV), large excition binding energy(60 meV), and its application in optoelectronics, catalyst, sensors, actuator and so on. The optical, electronic and magnetic properties of ZnO can be modulated by the appropriate doping, which will broaden the application of ZnO. Up to now, ZnO that have been doped with Al,Ga,In,N,Mn and Co are currently generating much research interest, principally for their novel properties, however, ZnO doped with Fe ions has rarely been reported.In this thesis, we firstly prepared Fe-dopped ZnO one dimensional nanostructures and (00l)-oriented ZnO nanorod films by using ZnFe-LDH and (00l)-oriented ZnFe-LDH film as precursors. The result are the following:1. ZnFe-LDH nanoparicles was prepared by a method of coprecipitation and uses them as precursors to obtain Fe doped ZnO one dimensional nanostructures by a simple thermal evaporation method at a lower temperature condition. XRD images and SAED patterns reveals the prepared sample is wurtzite ZnO single crystalline. This route for synthesis of Fe-doped ZnO nanostructure morphology, size and the content of Fe dopant can be effective controlled by adjusting the reaction temperature, reaction time and gas rate et al. We discussed the growth mechanism of Fe-doped ZnO nanostructures based on experiment results. In addition, the photoluminescence properties of the prepared Fe-doped ZnO nanoneedles, nanorods and nanowires were investigated.2. (00l)-oriented ZnFe-LDH films was prepared by a simple evaporation method of LDHs suspensions. We prepared (002)-oriented Fe doped ZnO nanorod films using (00l)-oriented LDH film as single precursors based on oriented interaction and topotactic transformation of LDHs. During the preparation, the (00l)-oriented LDH film was use not only as reactants for the growth nanorods, but also as substrate for its growth. We can effective control morphology and size of (002)-oriented ZnO nanorod films by Changing the reaction time, gas. The size of the ZnO nanorods ranges from 20nm to 100 nm in diameter and 80nm to 400nm in length. The photoluminescence spectra of the as-prepared ZnO film exhibited a dominant ultraviolet emission peak center at 390nm and weak structural peaks at 468nm,477nm in the visible region.