Fabrication and surface photovoltage study of hematite microparticles with hollow spindle-shaped structure

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• 作者：Hong Li^a ; ^b ; Qidong Zhao^a ; Xinyong Li^a ; ^c ; ^{xinyongli@hotmail.com} ; Yong Shi^a ; Guohua Chen^c
• 关键词：伪-Fe2O3 microparticles ; Hollow structure ; Optical properties ; Surface photovoltage
• 刊名：Applied Surface Science
• 出版年：2012
• 期刊代码：6_01694332
• 类别：ms
• 出版时间：1 July, 2012
• 卷：258
• 期：18
• 页码：7099-7104
• 文件大小：942 K

摘要

Hematite (伪-Fe₂O₃) particles with hollow spindle-shaped microstructure were successfully synthesized by a one-pot hydrothermal approach in large scale. The structural properties of the sample were systematically investigated by X-ray powder diffraction, scanning electron microscopy, energy-dispersive X-ray spectrum, high resolution transmission electron microscopy, selected-area electron diffraction techniques, UV-vis diffuse reflectance spectroscopy and infrared spectroscopy techniques. The characterization results revealed that the 伪-Fe₂O₃ microparticles with a single-domain crystalline structure was mainly grown along the (1 0 4) crystal plane. The valence states and the surface chemical compositions of 伪-Fe₂O₃ were further identified by X-ray photoelectron spectroscopy. The feature of photo-induced charge separation on spectrum was demonstrated by the surface photovoltage measurement under different external biases. The observed photoelectric characteristics of the as-fabricated material are beneficial for various optical and electronic applications.