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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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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 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.
College: College of Engineering
Issue: 33
Start Page: 17748
End Page: 17755