Magnetite nanoparticles with tunable gold or silver shell
Magnetite nanoparticles with tunable gold or silver shell
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DOI：
10.1016/j.jcis.2005.01.013
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发表时间：
2005-06-01
影响因子：
9.9
通讯作者：
Pal, T
中科院分区：
文献类型：
--
作者：
Mandal, M;Kundu, S;Pal, T
在80℃的水胶束介质中成功制备了尺寸约为13nm的Fe3O4纳米颗粒。为了使Fe3O4纳米颗粒具有抗表面中毒的能力，提出了在Fe3O4纳米颗粒表面包覆金或银等贵金属的新途径。通过调整组分的比例，核壳粒子的壳厚变得可调。因此，该方法可以在Fe3O4与贵金属前驱盐的比例不同的情况下，得到尺寸从18到30 nm的明确的核壳结构。通过x射线衍射（XRD）、透射电子显微镜（TEM）、磁共振成像（MR）、差示扫描量热法（DSC）、拉曼和温度相关的磁性研究对这些磁性纳米颗粒进行了表征。(c) 2005爱思唯尔公司版权所有。
Fe3O4 nanoparticles with size similar to 13 nm have been prepared successfully in aqueous micellar medium at similar to 80 degrees C. To make Fe3O4 nanoparticles resistant to surface poisoning a new route is developed for coating Fe3O4 nanoparticles with noble metals such as gold or silver as shell. The shell thickness of the core-shell particles becomes tunable through the adjustment of the ratio of the constituents. Thus, the route yields well-defined core-shell structures of size from 18 to 30 nm with varying proportion of Fe3O4 to the noble metal precursor salts. These magnetic nanoparticles were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), MR, differential scanning calorimetry (DSC), Raman and temperature-dependent magnetic studies. (c) 2005 Elsevier Inc. All rights reserved.