Effect of Heterojunction on the Behavior of Photogenerated Charges in Fe3O4@Fe2O3 Nanoparticle Photocatalysts

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• 作者：Xiao Wei ; Tengfeng Xie ; Linlin Peng ; Wei Fu ; Jiesheng Chen ; Qian Gao ; Guangyan Hong ; Dejun Wang
• 刊名：Journal of Physical Chemistry C
• 出版年：2011
• 出版时间：May 5, 2011
• 年：2011
• 卷：115
• 期：17
• 页码：8637-8642
• 全文大小：842K
• 年卷期：v.115,no.17(May 5, 2011)
• ISSN：1932-7455

文摘

The behavior of photogenerated charges in the Fe₃O₄@Fe₂O₃ core/shell nanoparticles with high photocatalytic activity have been investigated by surface photovoltage (SPV) spectroscopy and transient photovoltage (TPV) measurements. The single-phase Fe₃O₄ and Fe₂O₃ particles as references have been investigated simultaneously. The results demonstrate that the junction formation in the Fe₃O₄@Fe₂O₃ nanoparticles significantly affects the separation, transport, and recombination of photogenerated charges and even changes the transport direction and recombination velocity. And the mechanisms here have been discussed in detail. These results are helpful in understanding the photoelectric process of nanoscaled materials with the heterojunction structures and further utilizing the photoelectric materials and devices.