Magnetic Photocatalyst with p-n Junction: Fe3O4 ... Photocatalyst with p-n Junction: Fe 3O 4...
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Transcript of Magnetic Photocatalyst with p-n Junction: Fe3O4 ... Photocatalyst with p-n Junction: Fe 3O 4...
Magnetic Photocatalyst with p-n Junction: Fe3O4 Nanoparticle and FeWO4 Nanowire Heterostructure Xuan Cao, Yan Chen, Shihui Jiao, Zhenxing Fang, Man Xu, Xu Liu, Lu Li, Guangsheng Pang* and Shouhua Feng The band gaps of the Fe3O4/FeWO4 and pure FeWO4 were calculated by αhυ = (hυ–Eg)n. α is the absorbance, h is the Planck constant, υ is the phono frequency, Eg is the energy gap, and n is the pure numbers associated with the different types of electronic transitions. For n = 1/2, 2, 3/2, and 3, the transitions are the direct allowed, indirect allowed, direct forbidden, and indirect forbidden, respectively. The value of n for FeWO4 equals to 1/2 and the band gap was estimated (α = 0) to be 3.0 eV.
20 40 60 80
pH=7.5
Fe3O4 PDF 19-0629
Two Theta (degree)
pH=12
pH=3
FeWO4 PDF 46-1446
Inte
nsity
(a.u
.)
Fig. S1. As‐prepared products with various pH value of the solution. Pure FeWO4 nanowires (pH=3), Fe3O4/FeWO4 heterojunction (pH=7), pure Fe3O4 (pH=12).
Electronic Supplementary Material (ESI) for Nanoscale.This journal is © The Royal Society of Chemistry 2014
Fig. S2. SEM image of Fe3O4/FeWO4 composite nanowires. (pH=7.5)
Fig. S3. TEM image of FeWO4 nanowires. (pH=3)