We present a robust and facile method to produce metal nanoparticle (NP) alloys in a one-step synthesis using direct electrodeposition onto highly oriented pyrolytic graphite (HOPG). Precursor salts, H₂PtCl₆ and Pd(NO₃)₂, were dissolved in a 1 mM sodium dodecylsulfate (SDS) water droplet with 1× phosphate buffered saline solution and suspended in a dichloroethane (DCE) continuous phase. Tetrabutylammonium perchlorate was added to the DCE continuous phase to maintain charge balance during electrodeposition. NP fabrication via electrodeposition was driven by droplet collisions onto HOPG, which was biased at a potential where the metal precursor salts would reduce to their respective zero-valent atoms. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) were used to study the size, coverage, and morphology of the NPs as well as the atomic stoichiometry. EDX mapping indicated homogeneous distribution of Pd and Pt at the single NP level. Homogeneously alloyed PdPt NPs were realized from this study with demonstrated control over metal composition, surface coverage, and NP size.

我们提出了一种稳健而简便的方法，可使用直接电沉积到高度定向的热解石墨（HOPG）上的一步合成来生产金属纳米粒子（NP）合金。将前体盐H ₂ PtCl ₆和Pd（NO ₃）₂溶解在带有1x磷酸盐缓冲盐溶液的1 mM十二烷基硫酸钠（SDS）水滴中，并悬浮在二氯乙烷（DCE）连续相中。将高氯酸四丁铵添加到DCE连续相中，以在电沉积过程中保持电荷平衡。NP制造通过电沉积是通过液滴碰撞驱动到HOPG上的，HOPG被偏置在一个电位上，在该电位下，金属前体盐会还原为各自的零价原子。扫描电子显微镜（SEM）和能量色散X射线光谱（EDX）用于研究NP的尺寸，覆盖范围和形态以及原子化学计量。EDX映射表明在单个NP水平上Pd和Pt的均匀分布。从这项研究中获得了均匀合金化的PdPt NP，并证明了对金属成分，表面覆盖范围和NP尺寸的控制。