纳米线
纳米技术
拉曼散射
拉曼光谱
纳米颗粒
表面等离子体子
纳米结构
局域表面等离子体子
光化学
可见光谱
银纳米粒子
贵金属
表面增强拉曼光谱
作者
Wei Wei,Yongji Yao,Qi Zhao,Zhilong Xu,Qinfan Wang,Zongtao Zhang,Yanfeng Gao
出处
期刊:Nanoscale
[The Royal Society of Chemistry]
日期:2019-03-21
卷期号:11 (12): 5535-5547
被引量:35
摘要
Oxygen defects play a crucial role in a variety of functional transition metal oxides, ranging from materials to photoelectric devices. Tungsten oxide (WO3-x) is a type of transition metal oxide that has rich substoichiometric compositions and possesses oxygen defects. These oxygen defects determine the photon-electron interactions in the WO3-x structures. Therein, WO3-x quantum dots (QDs) exhibit fast carrier-transport for photon-electron interactions due to their strong quantum-size effects. Here, we report the use of non-stoichiometric WO3-x QDs, as a model material, in combination with silver nanowires (Ag NWs) to study photon-electron interactions on the nanoscale. We demonstrate that the incident photon-to-electron conversion efficiency can be increased by 8.5% and that the dye photodegradation performance was improved by 40% in a WO2.72 QD@Ag NW (WO2.72 QDs supported on AgNWs) composite compared to those of individual WO2.72 QDs under simulated AM 1.5G light. Furthermore, the WO3-x QD@Ag NW composite exhibits both activity and surface-enhanced Raman scattering (SERS) features, and the WO3-x QDs can be switched between a photocatalytic state and a SERS state by changing the stoichiometric ratio. The synergistic effects are ascribed to the plasmonic state of WO2.72 QDs upon light irradiation. This work provides new insight into the design of highly efficient transition metal oxide/plasmonic metal nanocomposites for photoelectric devices.
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