Department of Chemistry, Brown University, Providence, Rhode Island 02912, USA.
J Am Chem Soc. 2010 May 12;132(18):6524-9. doi: 10.1021/ja101305x.
Rational synthesis of Pt-Au(n) nanoparticles (NPs) has been achieved by overgrowing Au on Pt with n, the number of Pt-Au heterojunctions in each particle, controlled from 1 to 4, and the corresponding NPs in pear-, peanut-, or clover-like morphology. Monte Carlo simulation reveals that the morphology control can be correlated to a thermodynamic equilibrium of the Au coherence energy, the overall particle surface energy, and the heterogeneous Pt-Au interfacial energy in the composite system, which is manipulated by the seeding particle size and solvent polarity. The developed synthetic strategy together with the provided fundamental understanding of heterogeneous nucleation and heterostructure growth could have great potential toward the rational synthesis of composite nanomaterials with morphology control for advanced catalytic and other functional applications.
通过在 Pt 上外延生长 Au(n)（n 为每个粒子中 Pt-Au 异质结的数量，可控制为 1 至 4），实现了 Pt-Au(n)纳米粒子（NPs）的合理合成，得到了具有梨形、花生形或三叶草形形貌的相应 NPs。蒙特卡罗模拟表明，形貌控制可以与 Au 相干能、整体颗粒表面能以及复合体系中异质 Pt-Au 界面能的热力学平衡相关联，而这些能量可以通过种子颗粒尺寸和溶剂极性来调控。所开发的合成策略以及对异质成核和异质结构生长的基本理解，对于合理合成具有形貌控制的复合纳米材料以用于先进的催化和其他功能应用具有很大的潜力。
