College of Materials, Xiamen University, Xiamen 361005, People's Republic of China.
Nanotechnology. 2012 May 4;23(17):175301. doi: 10.1088/0957-4484/23/17/175301. Epub 2012 Apr 5.
Core-shell nanospheres (CSNSs) with hydrophobic cores and hydrophilic shells were fabricated via a simple mini-emulsion polymerization for the stabilization of platinum nanoparticles (Pt-NPs). The CSNSs showed extremely high loading capacity of Pt-NPs (the largest loading amount of the Pt-NPs was about 49.2 wt%). Importantly, the Pt-NPs/CSNSs nanocomposites had unexpected stability in aqueous solution. DLS results revealed that the CSNSs loaded with Pt-NPs exhibited almost no aggregation after standing for a long time . However, the Pt-NPs immobilized on the CSNSs were not straitlaced: they could transport and redistribute between CSNSs freely when the environmental temperature was higher than the melting point of the CSNS shell. Owing to their excellent stability in aqueous solution, the surface of the Pt-NPs/CSNSs nanocomposites could be further decorated easily. For example, polyaniline (PANI)-coated Pt-NPs/CSNSs, nickel (Ni)-coated Pt-NPs/CSNSs and PANI/Pt-NPs dual-layer hollow nanospheres were facilely fabricated from the Pt-NPs/CSNS nanocomposites.
核壳纳米球（CSNSs）具有疏水性内核和亲水性外壳，通过简单的微乳液聚合制备，用于稳定铂纳米粒子（Pt-NPs）。CSNSs 表现出极高的 Pt-NPs 负载能力（Pt-NPs 的最大负载量约为 49.2wt%）。重要的是，Pt-NPs/CSNSs 纳米复合材料在水溶液中具有出乎意料的稳定性。DLS 结果表明，负载 Pt-NPs 的 CSNSs 长时间放置后几乎没有聚集。然而，固定在 CSNSs 上的 Pt-NPs 并不安分：当环境温度高于 CSNS 壳的熔点时，它们可以在 CSNSs 之间自由运输和重新分布。由于其在水溶液中的优异稳定性，Pt-NPs/CSNSs 纳米复合材料的表面可以很容易地进一步修饰。例如，通过 Pt-NPs/CSNS 纳米复合材料很容易制备聚苯胺（PANI）包覆的 Pt-NPs/CSNSs、镍（Ni）包覆的 Pt-NPs/CSNSs 和 PANI/Pt-NPs 双层空心纳米球。
