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

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

doi:10.1039/c4cp02009j

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

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

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

26 Citations (Scopus)

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.

Original language	English
Pages (from-to)	17748-17755
Number of pages	8
Journal	Physical Chemistry Chemical Physics
Volume	16
Issue number	33
DOIs	https://doi.org/10.1039/c4cp02009j
Publication status	Published - 7 Sept 2014

ASJC Scopus subject areas

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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Sudhagar, P., Devadoss, A., Song, T., Lakshmipathiraj, P., Han, H., Lysak, V. V., Terashima, C., Nakata, K., Fujishima, A., Paik, U., & Kang, Y. S. (2014). Enhanced photocatalytic performance at a Au/N-TiO₂ hollow nanowire array by a combination of light scattering and reduced recombination. Physical Chemistry Chemical Physics, 16(33), 17748-17755. https://doi.org/10.1039/c4cp02009j

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title = "Enhanced photocatalytic performance at a Au/N-TiO2 hollow nanowire array by a combination of light scattering and reduced recombination",

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.",

author = "P. Sudhagar and Anitha Devadoss and Taeseup Song and P. Lakshmipathiraj and Hyungkyu Han and Lysak, {Volodymyr V.} and C. Terashima and Kazuya Nakata and A. Fujishima and Ungyu Paik and Kang, {Yong Soo}",

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Sudhagar, P , Devadoss, A, Song, T, Lakshmipathiraj, P, Han, H, Lysak, VV, Terashima, C, Nakata, K, Fujishima, A, Paik, U & Kang, YS 2014, 'Enhanced photocatalytic performance at a Au/N-TiO₂ hollow nanowire array by a combination of light scattering and reduced recombination', Physical Chemistry Chemical Physics, vol. 16, no. 33, pp. 17748-17755. https://doi.org/10.1039/c4cp02009j

TY - JOUR

T1 - Enhanced photocatalytic performance at a Au/N-TiO2 hollow nanowire array by a combination of light scattering and reduced recombination

AU - Sudhagar, P.

AU - Devadoss, Anitha

AU - Song, Taeseup

AU - Lakshmipathiraj, P.

AU - Han, Hyungkyu

AU - Lysak, Volodymyr V.

AU - Terashima, C.

AU - Nakata, Kazuya

AU - Fujishima, A.

AU - Paik, Ungyu

AU - Kang, Yong Soo

PY - 2014/9/7

Y1 - 2014/9/7

N2 - 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.

AB - 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.

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SN - 1463-9076

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JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

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ER -

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

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