中文摘要：

磁性纳米颗粒在生物医药方面的许多应用都要求在小尺度下仍具有高的磁性能。FePt纳米颗粒具有高的饱和磁化强度和高的磁晶各向异性,用有良好生物相容性的Au作表面包覆,形成核壳结构的FePt@Au纳米颗粒成为生物医药领域的首选研究对象。介绍用化学热分解法,制备尺寸均匀的、立方形貌的FePt纳米颗粒作籽晶,之后分散到溶液中再热分解乙酸金制备FePt@Au核壳结构颗粒。通过透射电镜（TEM）观测到包覆Au后颗粒尺寸长大,并且对单个颗粒进行了能谱分析（EDS）,结果表明,制备出来颗粒同时包含Fe、Pt、Au元素,证明所制备的颗粒具有FePt@Au的结构。对所制备的FePt@Au纳米颗粒的结构研究表明,Au原子在方形颗粒表面的不均匀形核是形成复合结构的主要生长机制。

英文摘要：

Many applications Magnetic nanoparticles in biomedicine require they under small scale still have high magnetic energy. FePt nanoparticles, with high saturation magnetization and high magnetocrystalline anisotropy, with good biocompatibility of surface coating of Au formed core-shell structure of FePt@Au nanoparticles, become preferred the object of study in the field of biomedicine. In this paper, using chemical thermal decomposition method, the preparation of uniform size, cubic morphology of FePt nanoparticle as a seed, and then dispersed into the solution and then thermally decomposed gold acetate prepared FePt@Au core-shell structure particles. By transmission electron microscopy （TEM） observation after Au-coated particle size grew, and X-ray energy dispersive spectroscopy （EDS） carried out on a single particle, the results showed that particles prepared contain Fe, Pt, Au elements, at the same time, is demonstrate the preparation of granular structure with FePt@Au. Research on structure of the prepared FePt@Au nanoparticles thows that Au atoms in heterogeneous nucleation on the surface of the rectangular particle is the main growth mechanism of composite structure.