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

Autor: Naya SI; Environmental Research Laboratory, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan., Akita A; Graduate School of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan h-tada@apch.kindai.ac.jp., Morita Y; Graduate School of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan h-tada@apch.kindai.ac.jp., Fujishima M; Graduate School of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan h-tada@apch.kindai.ac.jp.; Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan., Tada H; Graduate School of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan h-tada@apch.kindai.ac.jp.; Department of Applied Chemistry, Faculty of Science and Engineering, Kindai University 3-4-1, Kowakae Higashi-Osaka 577-8502 Osaka Japan.
Jazyk: angličtina
Zdroj: Chemical science [Chem Sci] 2022 Oct 14; Vol. 13 (42), pp. 12340-12347. Date of Electronic Publication: 2022 Oct 14 (Print Publication: 2022).
DOI: 10.1039/d2sc03549a
Abstrakt: 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-TiO 2 ) usually exhibits activity much higher than that of Au/anatase TiO 2 (Au/A-TiO 2 ) 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 TiO 2 particles by the conventional deposition precipitation method. Transmission electron microscopy analyses for the Au/TiO 2 particles ascertain that faceting of Au NPs is induced on R-TiO 2 by using a domain-matching epitaxial junction with the orientation of (111) Au //(110) R-TiO 2 , whereas non-faceted hemispherical Au NPs are exclusively formed on A-TiO 2 . The faceting probability of Au NPs ( P f ) on R-TiO 2 increases with decreasing Au particle size ( d Au ) to reach 14% at d Au = 3.6 nm. A clear positive correlation between the photocatalytic activity and P f 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/TiO 2 . In light of this finding, R-TiO 2 nanorods with a high percentage (95%) of {110} facets were hydrothermally synthesized and used for the support of Au NPs. Consequently, the P f value increases to as much as 94% to enhance the photocatalytic activity with respect to that of Au/R-TiO 2 with P f = 14% by factors of 2.2-4.4 depending on the type of reaction.
Competing Interests: There are no conflicts to declare.
(This journal is © The Royal Society of Chemistry.)
Databáze: MEDLINE
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