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

Research output: Contribution to journalArticlepeer-review

22 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 languageEnglish
Pages (from-to)17748-17755
Number of pages8
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number33
DOIs
Publication statusPublished - 30 Jul 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry

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