کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1524155 | 1511824 | 2012 | 5 صفحه PDF | دانلود رایگان |
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.
► The BiVO4 samples with different crystal forms were selectively synthesized.
► The VBXPS results show that the VB top of samples varied with the structure.
► Different VB top causes different band structures of both scheelite type BiVO4.
Journal: Materials Chemistry and Physics - Volume 136, Issues 2–3, 15 October 2012, Pages 930–934