Crystallographic interface control of the plasmonic photocatalyst consisting of gold nanoparticles and titanium(iv) oxide

被引：0

作者：

Naya, Shin-Ichi ^{[1
]}

Akita, Atsunobu ^{[2
]}

Morita, Yoko ^{[2
]}

Fujishima, Musashi ^{[2
,3
]}

Tada, Hiroaki ^{[2
,3
]}

机构：

[1] Environmental Research Laboratory, Kindai University, 3-4-1, Kowakae, Osaka, Higashi-Osaka,577-8502, Japan

[2] Graduate School of Science and Engineering, Kindai University, 3-4-1, Kowakae, Osaka, Higashi-Osaka,577-8502, Japan

[3] Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University, 3-4-1, Kowakae, Osaka, Higashi-Osaka,577-8502, Japan

来源：

Chemical Science | 2022年 / 43卷

基金：

日本学术振兴会;

关键词：

Fiber optic sensors - Gold compounds - High resolution transmission electron microscopy - Light - Metal nanoparticles - Nanorods - Oxide minerals - Particle size - Particle size analysis - Photocatalytic activity - Plasmonic nanoparticles - Plasmonics - Precipitation (chemical) - TiO2 nanoparticles - Titanium dioxide;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

A big question in the field of plasmonic photocatalysis is why a typical photocatalyst consisting of gold nanoparticles and rutile titanium(iv) oxide (Au/R-TiO2) usually exhibits activity much higher than that of Au/anatase TiO2 (Au/A-TiO2) under visible-light irradiation. Shedding light on the origin should present important guidelines for the material design of plasmonic photocatalysts. Au nanoparticles (NPs) were loaded on ordinary irregular-shaped TiO2 particles by the conventional deposition precipitation method. Transmission electron microscopy analyses for the Au/TiO2 particles ascertain that faceting of Au NPs is induced on R-TiO2 by using a domain-matching epitaxial junction with the orientation of (111)Au//(110)R-TiO2, whereas non-faceted hemispherical Au NPs are exclusively formed on A-TiO2. The faceting probability of Au NPs (Pf) on R-TiO2 increases with decreasing Au particle size (dAu) to reach 14% at dAu = 3.6 nm. A clear positive correlation between the photocatalytic activity and Pf in several test reactions indicates that the heteroepitaxial junction-induced faceting of Au NPs is the principal factor for governing the plasmonic photocatalytic activity of Au/TiO2. In light of this finding, R-TiO2 nanorods with a high percentage (95%) of {110} facets were hydrothermally synthesized and used for the support of Au NPs. Consequently, the Pf value increases to as much as 94% to enhance the photocatalytic activity with respect to that of Au/R-TiO2 with Pf = 14% by factors of 2.2-4.4 depending on the type of reaction. © 2022 The Royal Society of Chemistry.

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