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Dual plasmonic nanostructures for switching polarity of hot electron-induced photocurrent.
Nanoscale ( IF 5.8 ) Pub Date : 2020-06-17 , DOI: 10.1039/c9nr10413e
Taozheng Hu 1 , Jingyu Wu , Diyi Han , Yaxian Ni , Wen Dong , Zhuo Chen , Zhenlin Wang
Affiliation  

We report on the experimental investigation of polarity-switchable hot electron-induced photocurrents in dual-plasmonic nanostructures, consisting of two layers of gold nanoparticles (AuNPs) separated by a TiO2 film. Hot electrons generated through the non-radiative decay of the localized surface plasmon resonances supported by the top and bottom layers of AuNPs can be simultaneously injected into the TiO2 film in opposite directions and counteract each other. As a result, the polarity and magnitude of the net photocurrents can be tailored by controlling the population of hot electrons either generated from or collected by the two layers of AuNPs. We believe the wavelength-dependent photocurrent polarity switching could be useful for biosensors with a direct electrical readout and photoconversion applications.

中文翻译:

双等离子体纳米结构,用于切换热电子感应光电流的极性。

我们报告了在双等离子体纳米结构中由极性可切换的热电子诱导的光电流的实验研究,该结构由两层由TiO 2膜分隔的金纳米颗粒(AuNPs)组成。通过AuNPs顶层和底层支持的局部表面等离振子共振的非辐射衰减产生的热电子可同时注入TiO 2中朝相反的方向拍摄并互相抵消。结果,可以通过控制由两层AuNP产生或收集的热电子的数量来调整净光电流的极性和大小。我们认为,与波长有关的光电流极性切换可能对具有直接电读出和光转换应用的生物传感器有用。
更新日期:2020-07-16
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