Au修饰ZnO纳米棒的制备及紫外探测性能研究

Preparation and UV detection properties of Au modified ZnO nanomaterials

采用磁控溅射技术和水热法制备金(Au)纳米颗粒修饰的氧化锌(ZnO)纳米棒材料。利用场发射扫描电子显微镜、透射电子显微镜、X射线衍射仪和荧光光谱仪等测试设备对不同溅射功率下的Au纳米颗粒修饰的ZnO纳米棒进行了表征分析。实验结果表明,不同溅射功率下的ZnO纳米棒均呈六方纤锌矿结构,沿晶面(002)择优生长,具有较高的结晶度;修饰后ZnO纳米棒表面附着Au纳米颗粒,能有效增强其紫外光激发强度;当射频溅射功率为80 W时,ZnO纳米棒表现出最佳的紫外探测性能,相比于未修饰的ZnO纳米棒,Au纳米颗粒能抑制ZnO纳米棒的持续光电导(PPC)效应,其紫外探测的响应/恢复时间分别降低了6.05和4.54 s,光暗电流比由9.31提升至32.40,光响应度达到1.94A/W,显著增强了ZnO纳米棒紫外探测的能力。

Zinc oxide(ZnO)nanorods modified with gold(Au)nanoparticles were prepared by magnetron sputtering and hydrothermal method,and characterized by field emission scanning electron microscope,transmission 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 significantly enhances the UV detection capability of ZnO nanorods.