多孔道磁金复合纳米粒子(Fe_3O_4-Au/pSiO_2)的制备及结构表征

Preparation and Structure Characterization of Multi Channel Magnetic Gold Compound Nano-particles(Fe_3O_4-Au/pSiO_2)

采用分步包覆法制备了具有多核壳结构的磁金复合纳米粒子Fe3O4-Au/pSiO2,所得纳米粒子单分散性好,粒径较均匀,平均粒径为150nm。经过表面保护刻蚀处理后,粒子包覆层呈多孔道结构,平均孔径为7.3nm。由于多孔道包覆层的存在,磁金复合纳米粒子出现了位于536nm处金的表面等离子体共振峰,表明其具有一定的光通透性。与未刻蚀纳米粒子相比,刻蚀后的多孔道纳米粒子的饱和磁化强度提高了13.3emu/g,达到49.6emu/g。

Magnetic composite nano-particles Fe3O4-Au/pSiO2 with gold core-shell structure,good monodisperse,uniform particle size,and average particle diameter of 150 nm were prepared by step-coated method.After etching surface protection,coating layer of nano-particles is of porous channel structure with average pore size of 7.3nm.Plasmon resonance peaks occurring at 536 nm gold surface indicate that nano-particles have certain light permeability due to existence of multi-hole clad.Saturation magnetization intensity of porous road nano-particles is improved from 36.3emu/g of non-etched to 49.6emu/g of etched.