中文摘要：

采用化学共沉淀法制备了约25±5nm磁性四氧化三铁（Fe3O4）纳米粒子，并采用3-氨丙基三乙氧基硅烷（APTES）将Fe3O4纳米粒子表面修饰上氨基（-NH2）官能团，获得了表面氨基化的磁性Fe3O4纳米粒子．利用X-射线粉末衍射仪（XRD），透射电子显微镜（TEM），带有能谱仪（EDS）的扫描电子显微镜（SEM），光电子能谱仪（XPS），以及磁学测量系统（MPMS）对粒子的结构和性能进行了表征和分析．结果表明：表面氨基化后的磁性粒子粒径略有增加，室温下磁化强度由原来的64emu／g变为62．5emu／g，较好的保留了原始磁性特征．本研究结果对揭示纳米材料结构与性能关系、以及表面功能化磁性纳米材料制备与应用具有重要意义．

英文摘要：

Magnetic Fe3O4 nanoparticles of 25 ± 5 nm are prepared by modified chemical co-precipitation, and corresponding amino- coated magnetite nanoparticles are also obtained via surface 3 -aminopropyltriethyloxy silane （APTES） modification. The particles properties and structure are characterized and analyzed by X-Ray powder diffraction （ XRD）, scanning electron microscopy （ SEM ） with the energy dispersive spectroscopy （ EDS）, the Zetasizer Nanoinstrument, X - Ray photoelectron spectroscopy （XPS） and magnetic property measurement system （MPMS） with superconducting quantum interference device （SQUID） magnetometry. The result reveals that the magnetic particles have a slight dimensional increase in average diameter ,and that they while retain almost original saturation magnetization from 64 emu g - 1 to 62.5 emu g - 1 after amino coating. The findings are instructive to elucidate in depth some relationship between nanoparticle structure and property as well as in surface functionalization for nanomaterials fabrication and application.