School of Biological and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212003, China.
Nanoscale. 2013 Aug 21;5(16):7552-7. doi: 10.1039/c3nr01459b.
Herein, we demonstrate that uniform Ag nanoparticles could be directionally grafted on the tip of ZnO nanowire arrays by a simple photo-reduction method. Furthermore, the structure, position, and amount of Ag nanoparticles supported on ZnO nanowire arrays could be further rationally tailored by changing the reaction parameters such as the category, concentration of reagents, and annealing temperature. Moreover, their photoelectrochemical performances under both UV-vis and monochromatic light irradiation have been explored. Interestingly, the photocurrent density of Ag-ZnO heterostructures could reach up to 2.40 mA cm(-2), which is much higher than that of pure ZnO nanowire arrays. It has been proposed that the formation of ZnO nanowire arrays tip-grafted with Ag nanoparticles could promote the effective separation and directional transfer of photoexcited electron-hole pairs, and thus enhance the photoconversion properties.
在此，我们通过一种简单的光还原方法证明，均匀的 Ag 纳米颗粒可以定向接枝在 ZnO 纳米线阵列的尖端。此外，通过改变反应参数，如试剂的种类、浓度和退火温度，可以进一步合理地调整 ZnO 纳米线阵列上负载的 Ag 纳米颗粒的结构、位置和数量。此外，还探索了它们在紫外可见和单色光照射下的光电化学性能。有趣的是，Ag-ZnO 异质结构的光电流密度可达 2.40 mA cm(-2)，远高于纯 ZnO 纳米线阵列。据提出，形成 ZnO 纳米线阵列尖端接枝 Ag 纳米颗粒可以促进光激发电子空穴对的有效分离和定向转移，从而提高光转化性能。
