Probing long-lived plasmonic-generated charges in TiO2 /Au by high-resolution X-ray absorption spectroscopy

Angewandte Chemie
Lucia AmidaniFederico Boscherini

Abstract

Exploiting plasmonic Au nanoparticles to sensitize TiO2 to visible light is a widely employed route to produce efficient photocatalysts. However, a description of the atomic and electronic structure of the semiconductor sites in which charges are injected is still not available. Such a description is of great importance in understanding the underlying physical mechanisms and to improve the design of catalysts with enhanced photoactivity. We investigated changes in the local electronic structure of Ti in pure and N-doped nanostructured TiO2 loaded with Au nanoparticles during continuous selective excitation of the Au localized surface plasmon resonance with X-ray absorption spectroscopy (XAS) and resonant inelastic X-ray scattering (RIXS). Spectral variations strongly support the presence of long-lived charges localized on Ti states at the semiconductor surface, giving rise to new laser-induced low-coordinated Ti sites.

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Citations

Feb 24, 2017·Physical Chemistry Chemical Physics : PCCP·Alessandro MinguzziPaolo Ghigna
Dec 5, 2017·Physical Chemistry Chemical Physics : PCCP·Zakaria El KouraFederico Boscherini
Dec 6, 2018·Chemical Society Reviews·Mario J Muñoz-BatistaMarcos Fernández-García
Dec 21, 2018·Chemical Record : an Official Publication of the Chemical Society of Japan ... [et Al.]·Lorenzo MinoCarlo Lamberti
Feb 19, 2019·Advanced Materials·Luca MascarettiAlberto Naldoni
Mar 12, 2019·Journal of Synchrotron Radiation·Francesco d'AcapitoAndrea Martin
May 14, 2019·Physical Chemistry Chemical Physics : PCCP·Lucia AmidaniKristina O Kvashnina
Jun 15, 2020·The Journal of Chemical Physics·Haibin TangNianqiang Wu
Aug 31, 2019·Topics in Current Chemistry·Uriel Caudillo-FloresMarcos Fernández-García
Dec 10, 2020·Physical Chemistry Chemical Physics : PCCP·Anurag KawdeJohannes Messinger
Nov 24, 2020·ACS Applied Materials & Interfaces·Ce LiangPing Xu

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