单分散α-Fe2O3纳米结构空心亚微球的制备及表征

高等学校化学学报 ›› 2010, Vol. 31 ›› Issue (6): 1098.

单分散α-Fe₂O₃纳米结构空心亚微球的制备及表征

李群艳, 娄载亮, 王志宏, 解林艳, 韦奇, 聂祚仁

北京工业大学材料科学与工程学院, 北京100022

收稿日期:2009-10-28 出版日期:2010-06-10 发布日期:2010-06-10
通讯作者: 李群艳, 女, 博士, 副研究员, 主要从事金属氧化物纳米结构组装体的研究. E-mail: qyli@bjut.edu.cn
基金资助:
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.

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.

摘要/Abstract

摘要：

采用一种新的溶液生长法结合多步包覆法在自制的不同粒径SiO₂单分散亚微球表面包覆不同厚度的β-FeOOH涂层, 得到单分散β-FeOOH/SiO₂核壳结构亚微球. 实验结果表明, SiO₂核心颗粒尺寸对表面涂层的形态和包覆均匀性有很大影响. 当SiO₂核心颗粒的平均粒径为250 nm左右时, β-FeOOH表面涂层均匀, 颗粒间团聚较少, 一次包覆后涂层厚度约为35 nm. 涂层中β-FeOOH纳米棒的尺寸随着所选SiO₂核心颗粒粒径的增大而相应增大. 经多次包覆能够显著提高涂层的厚度, 3次包覆后β-FeOOH表面涂层厚约100 nm. β-FeOOH/SiO₂核壳结构亚微球与质量分数5%的NaOH溶液反应后, 于600 ℃焙烧2 h得到了单分散α-Fe₂O₃空心微球. 单分散α-Fe₂O₃空心亚微球表层是由α-Fe₂O₃纳米棒搭建而成的三维网络结构, α-Fe₂O₃纳米棒的尺寸与核壳结构中β-FeOOH纳米棒的尺寸基本一致.

关键词: 单分散; 纳米棒; α-Fe2O3; 二氧化硅; 空心亚微球

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

TrendMD:

李群艳, 娄载亮, 王志宏, 解林艳, 韦奇, 聂祚仁. 单分散α-Fe₂O₃纳米结构空心亚微球的制备及表征. 高等学校化学学报, 2010, 31(6): 1098.

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

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单分散α-Fe₂O₃纳米结构空心亚微球的制备及表征

Preparation and Characterization of Monodisperse α-Fe₂O₃ Nanostructured Hollow Submicrosphere

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