单分散α-Fe_2O_3纳米结构空心亚微球的制备及表征  

Preparation and Characterization of Monodisperse α-Fe_2O_3 Nanostructured Hollow Submicrosphere

作　　者：李群艳[1] 娄载亮[1] 王志宏[1] 解林艳[1] 韦奇[1] 聂祚仁[1] 

机构地区：[1]北京工业大学材料科学与工程学院,北京100022

出　　处：《高等学校化学学报》2010年第6期1098-1102,共5页Chemical Journal of Chinese Universities

基　　金：国家杰出青年科学基金(批准号:50525413);北京市委组织部优秀人才培养计划(批准号:62312311200701)资助

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.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.

关 键 词：单分散 纳米棒 Α-FE2O3 二氧化硅 空心亚微球 

分 类 号：O614.81[理学—无机化学]