Synthesis And Photoluminescent Properties Of ZnO Nanoarrays In Anodic Alumina Membrane

In this paper, anodic alumina membrane (AAM) contained high density nanoporous which had the same diameter and were parallel to each others was abtained. The nanoporous had ideal circular shape and their distribution were honeycombing and were ordered in several microns. The methods of Direct-electrodeposition and high temperature oxidation were applied to prepare ZnO/AAM nanoarrays, at the same time, the structure and appearance of ZnO nanowires, the influence of oxidation temperature and nanowires'shape to the photoluminescent properties were studied. The results show that: The structure of ZnO nanowires prepared by this method were hexagonal wurtzite and composed by nanoparticles or monocrystalline; there were no preferred orientation; More and more Zn transformed to ZnO and ZnO crystallines grew better with the temperature of oxidation grew higher; ZnO/AAM nanoarrays photolumined blue/green lights and the wavelength were in 530 - 570nm and would blue shift with the temperature of oxidation grew higher; When the diameter of ZnO nanowires were less than 70nm, the peak of optical spectrum would blue shift with the diameter growing; But when the diameter were more than 70nm, the phenomenon would become unobvious, and wide green wave would be observed; Generally, 70nm was the critical point of structure and photoluminescence of ZnO nanoarrays.In order to get doped ZnO nanoarrays, NH3 were applied during Zn oxidation. Investigated by XRD, XPS and PL spectrometer, we've found that N was successfully doped in ZnO and there was strong ultraviolet fluorescence emission.