中文摘要：

通过溶剂热法合成了较大粒径的磁性Fe3O4纳米粒子，使用3-氨丙基三乙氧基硅烷（APTES）在乙醇/异丙醇体系中将其表面功能化一层氨基，随后将金纳米粒子（AuNPs）自组装于Fe3O4粒子表面，得到了Fe3O4/AuNPs纳米粒子；采用透射电子显微镜（TEM）、X-射线衍射（XRD）、振动样品磁强计（VSM）和紫外-可见光吸收光谱仪（UV-Vis）对复合粒子的形态、结构及性质进行表征。结果表明：所制备的Fe3O4磁纳米粒子粒径均一，平均粒径约为250 nm，形状几乎都呈球形，磁性Fe3O4/AuNPs复合粒子包覆均匀、具有良好的的分散性和磁化率，同时兼有磁性和金纳米粒子的特性。

英文摘要：

Fe3O4 magnetic nanoparticles with large particle size were synthesized by a solvothermal method, and then modified by （3-aminopropyl）triethoxysilane （APTES） in the system of ethanol and isopropanol, which can functionalized the surface a layer of amino groups. Then, magnetic Fe3O4/Au nanoparticles were prepared by connecting gold nanoparticles under the condition of ultrasound. These composite particles have been characterized by transmission electron microscopy （TEM）, X-ray powder diffraction （XRD）, vibrating sample magnetometer（VSM） and ultraviolet-visible spectrophotometer （UV-Vis）. The result shows that the prepared Fe3O4 nanoparticles have a uniform particle size and spherical shape, the average size is 250 nm. Fe3O4/Au composite particles coated evenly, have a good dispersibility and magnetic susceptibility, possess magnetism and characteristics of gold nanoparticles at the same time.