基于MCM-41硬模板的镍铁磁性纳米管的合成及其磁性研究

以Si-MCM-41为硬模板,利用介孔材料的吸附作用,将Fe3+和Ni 2+按一定比例定量吸附组装到介孔材料的孔壁上;然后通过程序升温在900℃条件下高温焙烧,并经氢氟酸处理,得到直径大约为3.0nm的中空铁氧体纳米管.分别利用傅立叶变换红外光谱仪、扫描电镜、透射电镜、X射线衍射仪分析了合成材料的结构、组成、形貌;采用振动样品磁强计测定了其磁性能.结果表明,合成的镍铁氧体纳米管具有良好的管状形貌,其结构与分子筛MCM-41的结构相似,并具有良好的磁学性能.这说明MCM-41分子筛孔道结构具有可复制性,本研究可望为制备具有适当长径比的一维纳米磁性材料打下良好基础.

Synthesis and magnetic performance of nickel/iron ferrite nanotube based on MCM-41 hard template

Fe3＋ and Ni2＋ ions were adsorbed and assembled on the inner wall of mesoporous MCM-41 hard template in a certain ratio, followed by calcination at 900℃ and immersion in HF solution to afford hollow spinel ferrite nanotube （denoted as Ni2＋/Fe3＋/MCM-41） with a diameter of about 3.0 nm. The structure, composition, and morphology of as-prepared Ni2＋/ Fe3＋/MCM-41 nanotube were characterized by Fourier transform infrared spectrometry, scanning electron microscopy, transmission electron microscopy, and X-ray diffraction; and its magnetic performance was determined with a vibrating sample magnetometer. Results indicate that as-prepared Ni2＋/Fe3＋/MCM-41 nanotube has fine tubular morphology, its structure is similar to the structure of MCM-41, and it exhibits fine magnetic properties. This means that the pore-channel structure of MCM-41 molecular sieve can be reproduced, and the present approach could help to establish good ground for developing one-dimensional nanometer magnetic materials with an appropriate length to diameter ratio.