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给出一种温和条件下构筑Fe3O4/Au,Fe3O4/Au@SiO2复合纳米结构材料的方法,并研究所得产物的光学、磁学性质。首先,用3-氨丙基三甲氧基硅烷(APS)对平均粒径300 nm的Fe3O4微球进行表面修饰使得其拥有大量的氨基官能团(-NH2),利用这些官能团末端的孤对电子可以共价吸附Au纳米粒子的特性,在一定条件下制备出Fe3O4/Au复合纳米结构材料,不经过任何表面处理利用St?ber方法在室温条件下对其进行SiO2包覆,得到Fe3O4/Au@SiO2复合材料。借助场发射扫描电子显微镜(FESEM)、透射电子显微镜(TEM)对产物的形貌和结构进行表征,并利用紫外-可见(Uv-Vis)分光光度计和超导量子干涉仪(SQUID)对产物的光学和磁学性质进行分析。结果表明,由于所含金浓度太低,Fe3O4/Au复合材料并没有显示金纳米粒子的特征表面等离子体共振吸收峰;Fe3O4/Au,Fe3O4/Au@SiO2复合纳米结构均显示出超顺磁性和高的饱和磁化率。
A method of constructing Fe3O4 / Au, Fe3O4 / Au @ SiO2 composite nanostructured materials under mild conditions is given and the optical and magnetic properties of the obtained products are also studied. First, the surface modification of Fe3O4 microspheres with average diameter of 300 nm by 3-aminopropyltrimethoxysilane (APS) made it have a large number of amino functional groups (-NH2), and the lone pairs of electrons at the end of these functional groups Au3Fe3O4 / Au composite nanostructured materials were prepared under certain conditions without any surface treatment, and then coated with SiO2 by room temperature under the conditions of St? Ber to obtain Fe3O4 / Au @ SiO2 composite material. The morphology and structure of the product were characterized by means of field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The products were characterized by Uv-Vis spectrophotometer and SQUID The optical and magnetic properties were analyzed. The results show that the characteristic surface plasmon resonance absorption peaks of Fe3O4 / Au composites do not show that the Fe3O4 / Au composites show superparamagnetism and Fe3O4 / Au @ SiO2 composite nanostructures High saturation magnetization.