Metallic nanoparticles of Ag–Pt double-shell on Au-core (Au@Ag@Pt core@multishell NPs) with a hollow-granular shell structure were synthesized by coreduction method, a combination of galvanic replacement reaction with a coreducing agent. Their nanostructures were examined in detail at different reduction reaction periods to gain insights into the mechanism of Ag–Pt double-shell formation on Au-core, as well as the competitive role of each reduction reaction. The multishell NPs were found to contain a degree of hollows with the inner surface composed of both Ag and Pt, while the outer surface composed of granular Pt. The coreduction method contributed to the success of increasing Pt surface area that will further benefit catalytic applications of the NPs.

通过共还原法合成了具有空心颗粒壳结构的金核上的 Ag-Pt 双壳金属纳米粒子（Au@Ag@Pt 核@多壳 NPs），该方法将电置换反应与共还原剂相结合。在不同的还原反应阶段详细检查了它们的纳米结构，以深入了解 Au 核上 Ag-Pt 双壳形成的机制，以及每个还原反应的竞争作用。发现多壳纳米颗粒包含一定程度的空心，内表面由 Ag 和 Pt 组成，而外表面由颗粒状 Pt 组成。共还原方法有助于增加 Pt 表面积的成功，这将进一步有利于 NPs 的催化应用。