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Influence of nitrogen chemical states on photocatalytic activities of nitrogen-doped TiO<inf>2</inf> nanoparticles under visible light

Lee, S and Cho, IS and Lee, DK and Kim, DW and Noh, TH and Kwak, CH and Park, S and Hong, KS and Lee, JK and Jung, HS (2010) Influence of nitrogen chemical states on photocatalytic activities of nitrogen-doped TiO<inf>2</inf> nanoparticles under visible light. Journal of Photochemistry and Photobiology A: Chemistry, 213 (2-3). 129 - 135. ISSN 1010-6030

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Abstract

Nitrogen-doped TiO2 (N-TiO2) nanoparticles with a homogeneous anatase structure were synthesized using three different chemical methods. X-ray photoelectron spectra (XPS) analysis shows that nitrogen was successfully doped into TiO2 nanoparticles and the nitrogen atoms are present in both substitutional and interstitial sites. The electron binding energy (BE) of N 1s core level is found to depend on the synthesis methods. Changes in Ti-O bond lengths of the substitutional and interstitial N doped-TiO2 were calculated by computational geometry optimization, and confirmed by Raman shift analysis. Differences in UV-vis light absorption and visible-light-induced photocatalytic activity of three N-TiO2 samples were attributed to their different nitrogen states within TiO 2 lattice, which would create different defect levels. The defect levels were confirmed by photoluminescence (PL) analysis and density of states (DOSs) calculation. From one to one correspondence between XP spectrum and photocatalytic activities, it is concluded that nitrogen atoms in substitutional sites enhances the photocatalysis of TiO2 under visible light more effectively than nitrogen atoms in interstitial sites. © 2010 Elsevier B.V. All rights reserved.

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Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Lee, S
Cho, IS
Lee, DK
Kim, DW
Noh, TH
Kwak, CH
Park, S
Hong, KS
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Jung, HS
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 25 June 2010
Date Type: Publication
Journal or Publication Title: Journal of Photochemistry and Photobiology A: Chemistry
Volume: 213
Number: 2-3
Page Range: 129 - 135
DOI or Unique Handle: 10.1016/j.jphotochem.2010.05.011
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1010-6030
Date Deposited: 24 Oct 2014 14:49
Last Modified: 31 Aug 2019 20:55
URI: http://d-scholarship.pitt.edu/id/eprint/23409

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