MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, State Key Laboratory of Physical Chemistry of Solid Surfaces, iChEM, College of Chemistry and Chemical Engineering, and Xiamen University, Xiamen 361005, China.
Nanoscale. 2017 May 18;9(19):6254-6258. doi: 10.1039/c7nr00655a.
Surface plasmon resonance (SPR) has been utilized in many fields, such as surface-enhanced Raman spectroscopy (SERS) and solar energy conversion. Here we developed an Au@CdS core-shell nanostructure, a bifunctional nanoparticle, used as an efficient catalyst for SPR enhanced photocatalytic degradation, and as a substrate for in situ SERS detection of methylene blue (MB) and p-nitrophenol (pNTP). With integration of an Au nanoparticle into a CdS shell, the degradation process was significantly accelerated under 500 nm long-pass (λ > 500 nm) visible light irradiation, which was caused by the injection of hot electrons. Moreover, a highly uniform, monolayer film of Au@CdS nanoparticles (NPs) has been prepared and used as both a SERS substrate and catalyst. The decomposition of MB molecules and nitrogen coupling reaction of pNTP were observed during the 638 nm laser illumination. We demonstrate that a plasmonic core-semiconductor shell nanocomposite can be a promising material for photocatalysis and in situ SERS study.
表面等离子体共振（SPR）已在许多领域得到应用，如表面增强拉曼光谱（SERS）和太阳能转换。在这里，我们开发了一种 Au@CdS 核壳纳米结构，作为一种高效的 SPR 增强光催化降解催化剂和亚甲基蓝（MB）和对硝基苯酚（pNTP）的原位 SERS 检测的基底，这是一种双功能纳米粒子。通过将金纳米颗粒集成到 CdS 壳中，在 500nm 长通（λ>500nm）可见光照射下，降解过程显著加速，这是由热电子注入引起的。此外，我们还制备了高度均匀的 Au@CdS 纳米粒子（NPs）单层膜，并用做 SERS 基底和催化剂。在 638nm 激光照射下，观察到 MB 分子的分解和 pNTP 的氮偶联反应。我们证明了等离子体核-半导体壳纳米复合材料可以成为光催化和原位 SERS 研究的一种有前途的材料。
