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Cited by 295

The DOI matches its Crossref record; 85 of the 85 references it cites were found in a registry or an index.

Band-to-Band Visible-Light Photon Excitation and Photoactivity Induced by Homogeneous Nitrogen Doping in Layered Titanates

Liu, Gang, Wang, Lianzhou, Sun, Chenghua, Yan, Xiaoxia, Wang, Xuewen, Chen, Zhigang, Smith, Sean C., Cheng, Hui-Ming, Lu, Gao Qing·2009·Chemistry of Materials
DOI 10.1021/cm802986r
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Abstract

The distribution of dopants in semiconductors can intrinsically determine the electronic structure and consequently the absorbance, redox potential, and charge-carrier mobility of the semiconductor photocatalysts. In contrast to most reported nitrogen-doped titania photocatalysts with some localized states in the intrinsic band gap and small visible light absorption shoulders induced by inhomogeneous nitrogen doping near the particle surface, we report here the homogeneous substitution of O by N in the whole particles of layered titanates. The resultant materials Cs 0.68 Ti 1.83 O 4− x N x exhibited extraordinary band-to-band excitation in the visible-light ranging up to blue light. From photoelectron spectroscopy and first-principles calculations, the upward shift of valence band maximum by N 2p states is concluded as the cause of the band-to-band visible light excitation. The holes generated upon visible light excitation in the newly formed valence bands of Cs 0.68 Ti 1.83 O 4− x N x and H 0.68 Ti 1.83 O 4− x N x had strong oxidation ability in oxidizing OH − into active •OH radicals in photocatalysis. These findings are the clear evidence for the substantial role of homogeneous nitrogen doping in obtaining band-to-band visible-light photon excitation in layered titanates. The new physical insights into the electronic structure of homogeneous substitutional N in layered titanates gained here may have important implications for developing other efficient visible light photocatalysts by nonmetal doping.

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Metadata

Authors
Liu, G., Wang, L., Sun, C., Yan, X., Wang, X., Chen, Z., Smith, S. C., Cheng, H.-M., & Lu, G. Q.
Venue
Chemistry of Materials
Publisher
American Chemical Society (ACS)
Published
2009-03-10
Volume
21
Issue
7
Pages
1266-1274
ISSN
  • 0897-4756 (ISSN-L)
  • 1520-5002
DOI
10.1021/cm802986r
OpenAlex
W2014932067
Cited by
295
References
85
FWCI
10.44
Type
journal article
Language
en
Open access
closed

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