Yolk-like Micro/Nanoparticles with Superparamagnetic Iron Oxide Cores and Hierarchical Nickel Silicate Shells
Yolk-like Micro/Nanoparticles with Superparamagnetic Iron Oxide Cores and Hierarchical Nickel Silicate Shells
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DOI：
10.1002/adfm.201002191
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发表时间：
2011-05-24
影响因子：
19
通讯作者：
Gong, Xinglong
中科院分区：
文献类型：
--
作者：
Fang, Qunling;Xuan, Shouhu;Gong, Xinglong
采用溶胶-凝胶法和水热反应相结合的方法制备了以超顺磁性氧化铁（SPIO）为核、分级硅酸镍（NS）为壳的蛋黄状纳米/微米粒子（Yolk SPIO@NS），其中包括在SPIO粒子表面包覆SiO2，并将SiO2壳层转变为具有分级纳米结构的NS空心球。通过控制实验参数，成功制备了NS壳厚度和SPIO核尺寸可调的各种蛋黄/壳纳米结构。Au纳米粒子可以原位浸渍到蛋黄状微球中形成SPIO@NS/Au复合粒子，所制备的磁性纳米催化剂以RhB的催化还原为模型反应，表现出良好的催化活性。该方法简单易行，可推广到其他蛋黄状纳米微胶囊的合成。
Yolk-like nano/microparticles with superparamagnetic iron oxide (SPIO) cores and hierarchical nickel silicate (NS) shells, designated yolk SPIO@NS, are fabricated by combining the versatile sol-gel process and the hydrothermal reaction, involving the coating of SPIO particles with SiO2 and transformation of the SiO2 shells into NS hollow spheres with hierarchical nanostructures. Various yolk/shell nanostructures with tunable NS shell thicknesses and SPIO core sizes are successfully prepared by controlling the experimental parameters. Au nanoparticles can be impregnated into the yolk-like microspheres in situ to form SPIO@NS/Au composite particles and the as-prepared magnetic nanocatalysts show good catalytic activity, using the catalytic reduction of RhB as a model reaction. This facile method can be extended to the synthesis of other encapsulated particles with yolk-like nanostructure.