【摘要】 通过两步法合成了表面修饰Ag纳米颗粒的ZnO纳米棒阵列膜,并检测了该纳米棒阵列膜在波长为365 nm的紫外光照下的时域光电流曲线。与纯ZnO纳米棒阵列膜相比,Ag纳米颗粒修饰后ZnO纳米棒阵列膜在光电响应阶段有更大的响应值,最大达到7 490,约为纯ZnO纳米棒阵列膜响应值的50倍。而且,Ag纳米颗粒对ZnO纳米棒阵列膜弛豫阶段呈现的持续光电导(PPC)效应有很好的调控作用。相同恢复时间内,纯ZnO纳米棒阵列膜光电流恢复效率为25%,Ag纳米颗粒修饰后达到87%。Ag浓度越大,持续光电导(PPC)效应越不明显,这个现象使得通过简单改变表面Ag纳米颗粒的浓度来调控ZnO纳米棒阵列膜的PPC效应成为可能。更多还原

【Abstract】 The surface modified Ag/ZnO nanorod array films(NRAs) were synthesized by a two-step method, and the time-resolved photocurrent curves excited by ultraviolet light at 365 nm were examined. Compared with pure ZnO NRAs, Ag/ZnO NRAs showed larger response values in the photoelectric response phase with a maximum value of 7 490, which was about 50 times the value of the pure ZnO NRAs. Moreover, the surface-modified Ag nanoparticles had a good regulation effect on the persistent photoconductivity(PPC) effect of ZnO NRAs. The photocurrent recovery efficiency of the pure ZnO NRAs was 25%, while the ZnO NRAs modified with Ag reached 87% in the same time. The higher the concentration of Ag, the less obvious the persistent photoconductivity(PPC) effect would be achieved. This phenomenon made it possible to adjust the PPC effect of the ZnO NRAs by simply changing the amount of Ag nanoparticles on the surface.更多还原