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Nitrogen-doped TiO2 nanopowders prepared by chemical vapor synthesis: band structure and photocatalytic activity under visible light

Research on Chemical Intermediates volume 38, pages 1171–1180 (2012)Cite this article

Abstract

During chemical vapor synthesis of TiO2 nanopowders, nitrogen atoms were doped into the crystal lattice of TiO2. The nitrogen atoms were predominantly incorporated substitutionally in the crystal lattice of TiO2 nanopowders up to the doping level of 1.25 mol% nitrogen, whereas they were in both interstitial and substitutional sites over about 1.43 mol% nitrogen. From the photocatalytic activity of nitrogen-doped TiO2 estimated by decomposition of methylene blue under visible light, it was found that the substitutional nitrogen anions appearing at the low level doping was beneficial to its photocatalytic activity, whereas the interstitial ones appearing at the high level doping over 1.25 mol% nitrogen were not. The improved photocatalytic activity due to the substitutionally doped nitrogen was attributed to band gap narrowing which was confirmed by the studies of XPS, near edge X-ray absorption fine structure, and UV–Vis absorption.

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Acknowledgment

We thank the financial support from the Korean Ministry of Knowledge Economy (Project No. 1030811) and KIST institutional funding (Project No. 2E22114). We also thank NNCI Analysis Center at KIST for XRD measurements and Nano-analysis Center for XPS and TEM analysis. The NEXAFS measurements at PLS were supported in part by MOST and POSTECH.

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Authors and Affiliations

  1. Nano-Materials Research Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 136-791, Korea

    HyunSeock Jie, Ho-bum Lee, So-Hye Cho & Jong-Ku Park

  2. Department of Materials Science and Engineering, Korea University, Anam-dong 5-1, Seongbuk-gu, Seoul, 136-701, Korea

    Ho-bum Lee & Moo-Young Huh

  3. Department of Applied Chemistry, Graduate School of Engineering, Osaka Prefecture University, 1-1 Gakuen-cho, Naka-ku, Sakai, Osaka, 599-8531, Japan

    Masaya Matsuoka

  4. Nano Analysis Center, Korea Institute of Science and Technology, Hwarangno 14-gil 5, Seongbuk-gu, Seoul, 136-791, Korea

    Keun-Hwa Chae

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  1. HyunSeock Jie
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  2. Ho-bum Lee
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  4. Moo-Young Huh
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  7. Jong-Ku Park
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Correspondence to Jong-Ku Park.

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Jie, H., Lee, Hb., Chae, KH. et al. Nitrogen-doped TiO2 nanopowders prepared by chemical vapor synthesis: band structure and photocatalytic activity under visible light. Res Chem Intermed 38, 1171–1180 (2012). https://doi.org/10.1007/s11164-011-0456-y

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  • DOI: https://doi.org/10.1007/s11164-011-0456-y

Keywords

  • TiO2 nanopowders
  • Chemical vapor synthesis
  • Nitrogen doping
  • Visible light photocatalysis
  • Methylene blue degradation