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利用化学共沉淀法合成磁性Fe3O4微粒,使用硅烷化试剂APTES(3-氨丙基三乙氧基硅烷)在乙醇分散的Fe3O4微粒表面进行氨基化修饰,并通过酸碱滴定法测得氨基化Fe3O4微粒表面的氨基含量为0.15mmol/g。采用Frens法合成粒径在20nm左右的纳米级胶体金,进一步利用Au-N键将金纳米微粒组装到Fe3O4微粒表面。可见光吸收光谱分析表明金磁微粒在520nm-550nm处表现出由于Au存在而产生的特征吸收峰,同时原子吸收光谱分析也获得金磁微粒的Fe3O4:Au元素构成比例为1:0.97。
The magnetic Fe3O4 particles were synthesized by chemical co-precipitation method. Amino-modified Fe3O4 particles were surface-modified with silylation reagent APTES (3-aminopropyltriethoxysilane), and aminated Fe3O4 The amino group content on the surface of the particles was 0.15 mmol / g. Nanosized colloidal gold with particle size about 20nm was synthesized by Frens method, and gold nanoparticles were further assembled on the surface of Fe3O4 particles by Au-N bond. The results of visible light absorption spectroscopy showed that the characteristic absorption peaks of gold magnetic particles were observed at 520nm-550nm due to the presence of Au, and the atomic ratio of Fe3O4: Au was 1: 0.97.