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Correlation between photocatalytic efficacy and electronic band structure in hydrothermally grown TiO<inf>2</inf> nanoparticles

Yang, M and Hume, C and Lee, S and Son, YH and Lee, JK (2010) Correlation between photocatalytic efficacy and electronic band structure in hydrothermally grown TiO<inf>2</inf> nanoparticles. Journal of Physical Chemistry C, 114 (36). 15292 - 15297. ISSN 1932-7447

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Abstract

The effects of electronic band structure, electron-hole recombination, and photocatalytic property of N- and/or Fe-doped TiO2 were systematically explored. Hydrothermal reaction was used to incorporate N and/or Fe into TiO2 nanoparticles. Structural analysis using Raman spectra, X-ray diffraction, and transmission electron microscope (TEM) indicates that hydrothermally grown TiO2 particles have anatase phase, and their average size is ∼10 nm. In addition, hydrothermal doping of N and/or Fe was found to significantly modify the electronic band structure. The photocatalytic performance of undoped and doped nanomaterials was examined under UV or visible light. N doping increased the photocatalytic efficacy of TiO2 under visible light by more than 2 times. In contrast, Fe-doped and N/Fe-codoped TiO2 show worse photocatalytic performance than pure TiO2 under both UV and visible light, in spite of their smaller band gaps. Fluorescence of terephthalic acid indicates that a change in the photocatalytic performance of doped TiO2 is closely related to the amount of photoinduced radical ions. X-ray photoelectron spectroscopy and low-temperature photoluminescence were employed to study the doping mechanism. While both N and Fe facilitate the absorption of the visible light, it is found that only Fe increases the electron-hole recombination rate, leading to the opposite effects of N and Fe doping on the photocatalytic performance of TiO2. © 2010 American Chemical Society.


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Details

Item Type: Article
Status: Published
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Yang, M
Hume, C
Lee, S
Son, YH
Lee, JKjul37@pitt.eduJUL370000-0002-7778-7679
Centers: Other Centers, Institutes, Offices, or Units > Petersen Institute of NanoScience and Engineering
Date: 16 September 2010
Date Type: Publication
Journal or Publication Title: Journal of Physical Chemistry C
Volume: 114
Number: 36
Page Range: 15292 - 15297
DOI or Unique Handle: 10.1021/jp103764n
Schools and Programs: Swanson School of Engineering > Mechanical Engineering and Materials Science
Refereed: Yes
ISSN: 1932-7447
Date Deposited: 15 Oct 2014 20:31
Last Modified: 02 Feb 2019 21:55
URI: http://d-scholarship.pitt.edu/id/eprint/23253

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