Effect of Heterojunction on the Behavior of Photogenerated Charges in Fe3O4@Fe2O3 Nanoparticle Photocatalysts
Effect of Heterojunction on the Behavior of Photogenerated Charges in Fe3O4@Fe2O3 Nanoparticle Photocatalysts
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DOI：
10.1021/jp111250z
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发表时间：
2011-04
影响因子：
3.7
通讯作者：
Xiao Wei;T. Xie;Linlin Peng;Wei Fu;Jie‐Sheng Chen;Q. Gao;Guang-yan Hong;Dejun Wang
中科院分区：
文献类型：
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作者：
Xiao Wei;T. Xie;Linlin Peng;Wei Fu;Jie‐Sheng Chen;Q. Gao;Guang-yan Hong;Dejun Wang
通过表面光伏(SPV)谱和瞬时光伏(TPV)测量，研究了高光催化活性的Fe3O4@Fe2O3核壳纳米粒子的光生电荷行为。同时研究了单相Fe_3O_4和Fe_2O_3颗粒作为参照物。结果表明，Fe3O4@Fe2O3纳米粒子中结的形成对光生电荷的分离、输运和复合有重要影响，甚至改变了光生电荷的输运方向和复合速度。并对其中的作用机理进行了详细的讨论。这些结果有助于理解具有异质结结构的纳米材料的光电过程，并进一步利用光电材料和器件。
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.