Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 136, Issue 2-3, Pages 930-934Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2012.08.023
Keywords
Oxides; Chemical synthesis; X-ray photo-emission spectroscopy (XPS); Band-structure
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Funding
- National Natural Science Foundation of China [21103041, 50902044]
- National Postdoctoral Funding [2011M500786]
- Province and Ministry co-building Henan University Funding [SBGJ090512]
- Key Lab Building Project of Henan Province [102300413224]
- Young Key Teacher Project of Henan University
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The BiVO4 samples with different crystal forms were selectively synthesized by a coprecipitation route. The XRD and Raman spectra reveal that the samples were crystallized in tetragonal zircon type, tetragonal scheelite type and monoclinic scheelite type. The optical band gaps of BiVO4(t-z), BiVO4(t-s) and BiVO4(m-s) are 2.9, 2.6 and 2.45 eV, respectively. The valence-band XPS results indicate that the valence band (VB) top of BiVO4(t-s), BiVO4(t-z), and BiVO4(m-s) become more positive. The difference in band structure of BiVO4(m-s) and BiVO4(t-s) originates from the difference in the VB top. (C) 2012 Elsevier B.V. All rights reserved.
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