SYNTHESIS AND LUMINESCENCE PROPERTIES OF ZnO NANONEEDLE ARRAYS VIA ELECTRODEPOSITED METHOD

ZnO nanoneedle arrays were obtained from the transformation of ZnC2O4 precipitate, which was synthesized via electrodeposited method at room temperature. The diameter of those grown ZnO nanoneedles is about 80 nm. The XRD pattern and the HRTEM image indicate that the grown ZnO nanoneedles have the preferential growth toward (101) direction. The possible growth mechanism of the ZnC2O4 nanoneedle arrays is proposed and is different from the traditional V-L-S and V-S models. The study on the PL spectrum of those ZnO nanoneedles shows the near band-edge emission band (379 nm) and the green emission band (510 nm). Especially, a red shift of the green emission band emerges with the increase of the annealing temperature and time.