Dual plasmonic nanostructures for switching polarity of hot electron-induced photocurrent
Dual plasmonic nanostructures for switching polarity of hot electron-induced photocurrent
复制标题
用于切换热电子诱导光电流极性的双等离子体纳米结构
DOI：
10.1039/c9nr10413e
复制
发表时间：
2020
期刊：
影响因子：
6.7
通讯作者：
Wang Zhenlin
中科院分区：
文献类型：
--
作者：
Hu Taozheng;Wu Jingyu;Han Diyi;Ni Yaxian;Dong Wen;Chen Zhuo;Wang Zhenlin
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.
