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

Title
Enhanced photocatalytic performance at a Au/N-TiO2 hollow nanowire array by a combination of light scattering and reduced recombination
Author(s)
송태섭P. Sudhagar[P. Sudhagar]Anitha Devadoss[Anitha Devadoss]P. Lakshmipathiraj[P. Lakshmipathiraj]Hyungkyu Han[Hyungkyu Han]Volodymyr V. Lysak[Volodymyr V. Lysak]C. Terashima[C. Terashima]Kazuya Nakata[Kazuya Nakata]A. Fujishima[A. Fujishima]Ungyu Paik[Ungyu Paik]Yong Soo Kang[Yong Soo Kang]
Keywords
SENSITIZED SOLAR-CELLS; DOPED TIO2; THIN-FILMS; AU NANOPARTICLES; WATER; DEGRADATION; ABSORPTION; PHOTOELECTRODES; PHOTOANODES; OXIDATION
Issue Date
201409
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.16, no.33, pp.17748 - 17755
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 photocatatytic (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, similar to 4 fold (1.1 x 10(-2) min) more than does TiO2-NWs (2.9 x 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.
URI
http://hdl.handle.net/YU.REPOSITORY/30936http://dx.doi.org/10.1039/c4cp02009j
ISSN
1463-9076
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공과대학 > 신소재공학부 > Articles
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