Fe_3O_4@ TiO_2核壳磁性纳米材料的制备及表征  

Preparation and characterization of Fe_3 O_4 @ TiO_2 core-shell magnetic nanomaterials

作　　者：辛铁军[1] 张和鹏[1] 马明亮[1] 刘梦姣[1] 周轮伟[1] 张秋禹[1] 

机构地区：[1]西北工业大学理学院,空间物理与化学教育部重点实验室,西安710129

出　　处：《功能材料》2014年第1期72-77,共6页Journal of Functional Materials

基　　金：国家自然科学基金资助项目(51173146);国家重点基础研究发展计划(973计划)资助项目(2010CB635111);西北工业大学博士论文创新基金资助项目(CX201238)

摘　　要：利用溶剂热法制备了单分散Fe3O4纳米粒子,以钛酸四丁酯(TBOT)为前驱体,采用溶胶-凝胶与溶剂热两步法制备了3种不同形貌的磁性核壳材料Fe3O4@TiO2。通过扫描电镜(SEM)、透射电镜(TEM)、X射线衍射仪(XRD)、热重分析(TGA)及振动样品磁强计(VSM)对材料的形貌、结构、磁学性能等进行了分析表征。结果表明,TiO2在Fe3O4颗粒表面形成很好的包覆层,产物结晶度高、形态规则、磁性能优良,为其在环境净化、生物医学、能源转换与存储等领域的潜在应用提供了有利条件。此外,还对TiO2壳层的包覆机理做了初步的研究。Core-shell magnetic Fe3O4@TiO2 nanomaterials with different morphologies have been obtained by combining the sol-gel method and solvothermal method.The monodisperse Fe3 O 4 core was synthesized by sol-vothermal reaction,and the TiO 2 shell was derived using solvothermal reaction and sol-gel method with tetra-butyl titanate as the precursor.The morphology,structure and magnetic properties of Fe3 O 4 @TiO 2 nanomate-rials were characterized by scanning electron microscopy （SEM）,transmission electron microscopy （TEM）,X-ray diffraction （XRD）,thermogravimetric analysis （TGA）and vibrating sample magnetometer （VSM）.The re-sults showed that Fe3 O 4 nanoparticles were coated by TiO 2 ,and Fe3 O 4 @TiO 2 exhibited high degree of crystal-linity,regular crystalline morphologies and excellent magnetism.These integrated features would make the Fe3 O 4 @TiO 2 materials have attractive applications in areas of environmental purification,biomedical field,en-ergy conversion and storage.In addition,the formation mechanism of TiO 2 shell was also proposed.

关 键 词：溶剂热 溶胶-凝胶 核壳结构 Fe3O4@TiO2 

分 类 号：TQ134[化学工程—无机化工] O614[理学—无机化学]