Preparation and Characterization of Monodisperse α-Fe2O3 Nanostructured Hollow Submicrosphere

Chem. J. Chinese Universities ›› 2010, Vol. 31 ›› Issue (6): 1098.

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Preparation and Characterization of Monodisperse α-Fe₂O₃ Nanostructured Hollow Submicrosphere

LI Qun-Yan*, LOU Zai-Liang, WANG Zhi-Hong, XIE Lin-Yan, WEI Qi, NIE Zuo-Ren

College of Materials Science and Engineering, Beijing University of Technology, Beijing 100022, China

Received:2009-10-28 Online:2010-06-10 Published:2010-06-10
Contact: LI Qun-Yan. E-mail: qyli@bjut.edu.cn
Supported by:
国家杰出青年科学基金(批准号: 50525413)和北京市委组织部优秀人才培养计划(批准号: 62312311200701)资助.

Abstract

Abstract:

The home-made monodisperse SiO₂ submicrospheres were coated with β-FeOOH by a new solution growth method. The size of SiO₂ submicrospheres had great influence on the microstructures of β-FeOOH coatings. When the average diameter of the submicrospheres was 250 nm, the β-FeOOH coating was uniform and the average thickness of β-FeOOH coatings was about 35 nm after the first cycle of coating. The thickness of β-FeOOH coatings increased greatly with multistep coating. After three cycles of coating, the thickness of β-FeOOH coatings increased to about 100 nm. The core-shell composites were immersed in NaOH solution(5%, mass fraction) at 40 ℃ for 24 h to remove the silica cores and then calcined at 600 ℃ for 24 h to prepare the monodisperse α-Fe₂O₃ hollow submicrospheres. The α-Fe₂O₃ shells in the hollow submicrospheres were constructed with α-Fe₂O₃ nanorods interconnected.

Key words: Monodisperse; Nanorod; α-Fe2O3; SiO2; Hollow submicrosphere

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LI Qun-Yan*, LOU Zai-Liang, WANG Zhi-Hong, XIE Lin-Yan, WEI Qi, NIE Zuo-Ren. Preparation and Characterization of Monodisperse α-Fe₂O₃ Nanostructured Hollow Submicrosphere[J]. Chem. J. Chinese Universities, 2010, 31(6): 1098.

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Preparation and Characterization of Monodisperse α-Fe₂O₃ Nanostructured Hollow Submicrosphere

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