TiO2 coated Au/Ag nanorods with enhanced photocatalytic activity under visible light irradiation

Na Zhou; Lakshminarayana Polavarapu; Nengyue Gao; Yanlin Pan; Peiyan Yuan; Qing Wang; Qing-Hua Xu

doi:10.1039/C3NR00517H

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TiO₂ coated Au/Ag nanorods with enhanced photocatalytic activity under visible light irradiation†

Na Zhou,^ab Lakshminarayana Polavarapu,^ab Nengyue Gao,^a Yanlin Pan,^ab Peiyan Yuan,^ab Qing Wang^bc and Qing-Hua Xu*^ab

Author affiliations

* Corresponding authors

^a Department of Chemistry, National University of Singapore, Singapore 117543
E-mail: chmxqh@nus.edu.sg

^b NUSNNI-Nanocore, National University of Singapore, Singapore 117576

^c Department of Materials Science and Engineering, National University of Singapore, Singapore 117576

Abstract

A facile method was used to prepare uniform Au NR/TiO₂ and Au/Ag NR/TiO₂ core–shell composite nanoparticles. Au/Ag NR/TiO₂ nanoparticles were found to display significantly enhanced visible light photo-catalytic activity compared to Au NR/TiO₂ and the commercially available TiO₂ nanoparticles. The enhancement mechanism was ascribed to injection of hot electrons of photo-excited Au/Ag NRs to TiO₂, which was confirmed by 633 nm laser induced reduction of silver ions on the surface of Au/Ag NR/TiO₂ composite nanoparticles.

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Article information

DOI: https://doi.org/10.1039/C3NR00517H
Article type: Paper
Submitted: 29 Jan 2013
Accepted: 06 Mar 2013
First published: 12 Mar 2013

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Nanoscale, 2013,5, 4236-4241

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TiO₂ coated Au/Ag nanorods with enhanced photocatalytic activity under visible light irradiation

N. Zhou, L. Polavarapu, N. Gao, Y. Pan, P. Yuan, Q. Wang and Q. Xu, Nanoscale, 2013, 5, 4236 DOI: 10.1039/C3NR00517H

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