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Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination

Sudhagar Pitchaimuthu Orcid Logo, Anitha Devadoss Orcid Logo, Taeseup Song, P. Lakshmipathiraj, Hyungkyu Han, Volodymyr V. Lysak, C. Terashima, Kazuya Nakata, A. Fujishima, Ungyu Paik, Yong Soo Kang

Phys. Chem. Chem. Phys., Volume: 16, Issue: 33, Pages: 17748 - 17755

Swansea University Authors: Sudhagar Pitchaimuthu Orcid Logo, Anitha Devadoss Orcid Logo

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DOI (Published version): 10.1039/c4cp02009j

Abstract

We demonstrate one-step gold nanoparticle (AuNP) coating and the surface nitridation of TiO2 nanowires (TiO2-NWs) to amplify visible-light photon reflection. The surface nitridation of TiO2-NW arrays maximizes the anchoring of AuNPs, and the subsequent reduction of the band gap energy from 3.26 eV t...

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Published in: Phys. Chem. Chem. Phys.
ISSN: 1463-9076 1463-9084
Published: 2014
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URI: https://cronfa.swan.ac.uk/Record/cronfa34462
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spelling 2020-07-01T16:20:57.6684771 v2 34462 2017-06-23 Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination 2fdbee02f4bfc5a1b174c8bd04afbd2b 0000-0001-9098-8806 Sudhagar Pitchaimuthu Sudhagar Pitchaimuthu true false a01150750f1c8eccbfeebffdde3fe8a1 0000-0002-8052-1820 Anitha Devadoss Anitha Devadoss true false 2017-06-23 EEN We demonstrate one-step gold nanoparticle (AuNP) coating and the surface nitridation of TiO2 nanowires (TiO2-NWs) to amplify visible-light photon reflection. The surface nitridation of TiO2-NW arrays maximizes the anchoring of AuNPs, and the subsequent reduction of the band gap energy from 3.26 eV to 2.69 eV affords visible-light activity. The finite-difference time-domain (FDTD) simulation method clearly exhibits the enhancement in the strengths of localized electric fields between AuNPs and the nanowires, which significantly improves the photocatalytic (PC) performance. Both nitridation and AuNP decoration of TiO2-NWs result in beneficial effects of high (e−/h+) pair separation through healing of the oxygen vacancies. The combined effect of harvesting visible-light photons and reducing recombination in Au/N-doped TiO2-NWs promotes the photocatalytic activity towards degradation of methyl orange to an unprecedented level, ∼4 fold (1.1 × 10−2 min) more than does TiO2-NWs (2.9 × 10−3 min−1). The proposed AuNP decoration of nitridated TiO2-NW surfaces can be applied to a wide range of n-type metal oxides for photoanodes in photocatalytic applications. Journal Article Phys. Chem. Chem. Phys. 16 33 17748 17755 1463-9076 1463-9084 31 12 2014 2014-12-31 10.1039/c4cp02009j http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000341064800044&amp;KeyUID=WOS:000341064800044 COLLEGE NANME Engineering COLLEGE CODE EEN Swansea University 2020-07-01T16:20:57.6684771 2017-06-23T13:05:04.4965177 Faculty of Science and Engineering School of Engineering and Applied Sciences - Uncategorised Sudhagar Pitchaimuthu 0000-0001-9098-8806 1 Anitha Devadoss 0000-0002-8052-1820 2 Taeseup Song 3 P. Lakshmipathiraj 4 Hyungkyu Han 5 Volodymyr V. Lysak 6 C. Terashima 7 Kazuya Nakata 8 A. Fujishima 9 Ungyu Paik 10 Yong Soo Kang 11
title Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
spellingShingle Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
Sudhagar Pitchaimuthu
Anitha Devadoss
title_short Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
title_full Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
title_fullStr Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
title_full_unstemmed Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
title_sort Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
author_id_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b
a01150750f1c8eccbfeebffdde3fe8a1
author_id_fullname_str_mv 2fdbee02f4bfc5a1b174c8bd04afbd2b_***_Sudhagar Pitchaimuthu
a01150750f1c8eccbfeebffdde3fe8a1_***_Anitha Devadoss
author Sudhagar Pitchaimuthu
Anitha Devadoss
author2 Sudhagar Pitchaimuthu
Anitha Devadoss
Taeseup Song
P. Lakshmipathiraj
Hyungkyu Han
Volodymyr V. Lysak
C. Terashima
Kazuya Nakata
A. Fujishima
Ungyu Paik
Yong Soo Kang
format Journal article
container_title Phys. Chem. Chem. Phys.
container_volume 16
container_issue 33
container_start_page 17748
publishDate 2014
institution Swansea University
issn 1463-9076
1463-9084
doi_str_mv 10.1039/c4cp02009j
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Engineering and Applied Sciences - Uncategorised{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Engineering and Applied Sciences - Uncategorised
url http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&amp;SrcAuth=ORCID&amp;SrcApp=OrcidOrg&amp;DestLinkType=FullRecord&amp;DestApp=WOS_CPL&amp;KeyUT=WOS:000341064800044&amp;KeyUID=WOS:000341064800044
document_store_str 0
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description We demonstrate one-step gold nanoparticle (AuNP) coating and the surface nitridation of TiO2 nanowires (TiO2-NWs) to amplify visible-light photon reflection. The surface nitridation of TiO2-NW arrays maximizes the anchoring of AuNPs, and the subsequent reduction of the band gap energy from 3.26 eV to 2.69 eV affords visible-light activity. The finite-difference time-domain (FDTD) simulation method clearly exhibits the enhancement in the strengths of localized electric fields between AuNPs and the nanowires, which significantly improves the photocatalytic (PC) performance. Both nitridation and AuNP decoration of TiO2-NWs result in beneficial effects of high (e−/h+) pair separation through healing of the oxygen vacancies. The combined effect of harvesting visible-light photons and reducing recombination in Au/N-doped TiO2-NWs promotes the photocatalytic activity towards degradation of methyl orange to an unprecedented level, ∼4 fold (1.1 × 10−2 min) more than does TiO2-NWs (2.9 × 10−3 min−1). The proposed AuNP decoration of nitridated TiO2-NW surfaces can be applied to a wide range of n-type metal oxides for photoanodes in photocatalytic applications.
published_date 2014-12-31T03:42:46Z
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score 10.997866

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