摘要
分别以Fe3O4、β-FeOOH、和α-Fe2O3作为前驱物,采用Stober水解法制备了氧化铁/氧化硅核壳结构,研究了前驱物种类和原料用量对二氧化硅包覆过程的影响.随着氨水和TEOS用量的增加,包覆层厚度增加,包覆更加均匀.对样品进行了扫描电镜(SEM)、透射电镜(TEM)和红外光谱(IR)表征.实验结果表明,在三种类型的前驱物中,二氧化硅在β-FeOOH表面包覆最均匀,包覆效果最好.
Fe3O4, β-FeOOH and α-Fe203 were used as the precursor for the preparation of iron oxide/silica core-shell structures by Stober method. The effects of the precursors, the concentra- tion of TEOS and ammonia on the coating process of silica were investigated. With the increasing ammonia and TEOS concentration, the silica layer thickness increased and became uniform. The samples were characterized by scanning electron microscopy （SEM）, transmission electron mi- croscopy （TEM）, and infrared spectrum （IR）. The results showed that β-FeOOH was better than the other two precursors because its OH led to the formation of uniform silica layer.
出处
《山东理工大学学报（自然科学版）》
CAS
2013年第5期13-16,共4页
Journal of Shandong University of Technology:Natural Science Edition
基金
山东省自然科学基金资助项目(ZR2010EM059)
山东理工大学青年教师发展支持计划(4072:110019)
关键词
核壳结构
前驱物
二氧化硅
core-shell structure
precursor
silica
