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Influence of nitrogen chemical states on photocatalytic activities of nitrogen-doped TiO2 nanoparticles under visible light

Paper ID Volume ID Publish Year Pages File Format Full-Text
27594 44031 2010 7 PDF Available
Title
Influence of nitrogen chemical states on photocatalytic activities of nitrogen-doped TiO2 nanoparticles under visible light
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 TiO2 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.

Keywords
Nitrogen-doped TiO2; Chemical states; XPS; Visible light; Photocatalyst
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Influence of nitrogen chemical states on photocatalytic activities of nitrogen-doped TiO2 nanoparticles under visible light
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 213, Issues 2–3, 25 June 2010, Pages 129–135
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
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Price was $35.95
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