Preparation and UV detection properties of Au modified ZnO nanomaterials
Zinc oxide(ZnO)nanorods modified with gold(Au)nanoparticles were prepared by magnetron sput-tering and hydrothermal method,and characterized by field emission scanning electron microscope,transmis-sion electron microscope,X-ray diffractometer and fluorescence spectrometer at different sputtering powers.The experimental results show that the ZnO nanorods at different sputtering powers are hexagonal wurtzite structure,grow along the crystal surface(002),and have high crystallinity.The UV excitation intensity of modified ZnO nanorods can be effectively enhanced by attaching Au nanoparticles to the surface.When the RF sputtering power is 80 W,ZnO nanorods show the best UV detection performance.Compared with unmodified ZnO nanorods,Au nanoparticles can inhibit the persistent photoconductivity(PPC)effect of ZnO nanorods,and the response/recovery time of UV detection is reduced by 6.05 s and 4.54 s,respectively.The photodark current ratio is increased from 9.31 to 32.40,and the photo responsiveness is up to 1.94 A/W,which signifi-cantly enhances the UV detection capability of ZnO nanorods.
万方数据
维普
