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Issue 33, 2014
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Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination

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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.

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

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Publication details

The article was received on 09 May 2014, accepted on 23 Jun 2014 and first published on 24 Jun 2014


Article type: Paper
DOI: 10.1039/C4CP02009J
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Citation: Phys. Chem. Chem. Phys., 2014,16, 17748-17755
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    Enhanced photocatalytic performance at a Au/N–TiO2 hollow nanowire array by a combination of light scattering and reduced recombination

    P. Sudhagar, A. Devadoss, T. Song, P. Lakshmipathiraj, H. Han, V. V. Lysak, C. Terashima, K. Nakata, A. Fujishima, U. Paik and Y. S. Kang, Phys. Chem. Chem. Phys., 2014, 16, 17748
    DOI: 10.1039/C4CP02009J

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