Surface Chemistry Laboratory of Electronic Materials, Department of Chemical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Korea.
Nanoscale. 2017 Apr 20;9(16):5342-5351. doi: 10.1039/c7nr00336f.
In this work, an outer-to-inner strategy is demonstrated to simultaneously fabricate core-shell NPs and assemble them onto a scaffold. Specifically, the shell material is deposited onto the scaffold first, and then a layer of the core material (Au) is covered on the shell surface. Finally, the core (Au)-shell nanoparticles (NPs) are formed on the scaffold after annealing. As examples, Au-BiS, Au-CdS and Au-CdSe core-shell NPs are grown on the surface of ZnO nanorods (NRs) via this strategy and exhibit enhanced photoelectrochemical (PEC) efficiency. The enhanced PEC performance is ascribed to improved light absorption induced by the plasmonic effect, trapped electrons of Au NPs, and cascade band alignment of the shell material and ZnO. The synthetic method gives a universal route to the development of nanodevices with assembled core-shell NPs. The core-shell NPs in the current study possess significant potential as building blocks for future PEC anodes or other solar conversion systems.
在这项工作中，展示了一种从外向内的策略，用于同时制备核壳纳米粒子并将其组装到支架上。具体来说，首先将壳材料沉积到支架上，然后在壳表面覆盖一层核材料（Au）。最后，在退火后，在支架上形成核（Au）-壳纳米粒子（NPs）。例如，通过这种策略，在 ZnO 纳米棒（NRs）表面生长了 Au-BiS、Au-CdS 和 Au-CdSe 核壳 NPs，并表现出增强的光电化学（PEC）效率。增强的 PEC 性能归因于等离子体效应引起的光吸收增强、Au NPs 的捕获电子以及壳材料和 ZnO 的级联能带排列。该合成方法为开发具有组装核壳 NPs 的纳米器件提供了一种通用途径。本研究中的核壳 NPs 作为未来 PEC 阳极或其他太阳能转换系统的构建块具有重要的潜力。
