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The Polarization Effect in Surface‐Plasmon‐Induced Photocatalysis on Au/TiO 2 Nanoparticles
Author(s) -
Gao Yuying,
Nie Wei,
Zhu Qianhong,
Wang Xun,
Wang Shengyang,
Fan Fengtao,
Li Can
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202007706
Subject(s) - materials science , plasmon , polarization (electrochemistry) , surface photovoltage , surface plasmon , photocatalysis , semiconductor , optoelectronics , surface plasmon resonance , charge density , nanoparticle , kelvin probe force microscope , surface plasmon polariton , optics , nanotechnology , chemistry , physics , atomic force microscopy , spectroscopy , biochemistry , quantum mechanics , catalysis
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° 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.