The Polarization Effect in Surface-Plasmon-Induced Photocatalysis on Au/TiO2Nanoparticles
The Polarization Effect in Surface-Plasmon-Induced Photocatalysis on Au/TiO2Nanoparticles
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DOI：
10.1002/anie.202007706
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发表时间：
2020-08-13
影响因子：
16.6
通讯作者：
Li, Can
中科院分区：
文献类型：
--
作者：
Gao, Yuying;Nie, Wei;Li, Can
控制偏振光与不对称纳米结构（例如金属/半导体异质结构）的相互作用为调节表面等离子体激发和近场空间分布提供了机会。然而，光偏振对界面电荷传输和等离子体金属/半导体光催化剂光催化的影响尚不清楚。在此，我们结合光子辐照开尔文探针力显微镜（KPFM）和电磁场模拟，揭示了在单粒子水平上45度入射光照射下Au/TiO（2）纳米粒子中等离子体电荷分离和空间分布的偏振依赖性。我们通过研究偏振相关的表面光电压（SPV）定量揭示局部电荷密度和偏振角之间的关系。当偏振方向垂直于Au/TiO(2)界面时，等离子体诱导的光催化活性增强。
Controlling the interaction of polarization light with an asymmetric nanostructure such as a metal/semiconductor heterostructure provides opportunities for tuning surface plasmon excitation and near-field spatial distribution. However, light polarization effects on interfacial charge transport and the photocatalysis of plasmonic metal/semiconductor photocatalysts are unclear. Herein, we reveal the polarization dependence of plasmonic charge separation and spatial distribution in Au/TiO(2)nanoparticles under 45 degrees incident light illumination at the single-particle level using a combination of photon-irradiated Kelvin probe force microscopy (KPFM) and electromagnetic field simulation. We quantitatively uncover the relationship between the local charge density and polarization angle by investigating the polarization-dependent surface photovoltage (SPV). The plasmon-induced photocatalytic activity is enhanced when the polarization direction is perpendicular to the Au/TiO(2)interface.