Deng Lianlian, Nguyen Mai Thanh, Shi Jingming, Chau Yuen-Ting Rachel, Tokunaga Tomoharu, Kudo Masaki, Matsumura Syo, Hashimoto Naoyuki, Yonezawa Tetsu
Division of Materials Science and Engineering, Faculty of Engineering, Hokkaido University, Kita 13 Nishi 8, Kita-ku, Sapporo, Hokkaido 060-8628, Japan.
Institute of Materials and Systems for Sustainability, Nagoya University, Furo-cho, Chikusa-ku, Nagoya 464-8603, Japan.
Langmuir. 2020 Mar 31;36(12):3004-3015. doi: 10.1021/acs.langmuir.0c00152. Epub 2020 Mar 19.
Pt/Au alloy nanoparticles (NPs) in a wide composition range have been synthesized by room-temperature simultaneous sputter deposition from two independent magnetron sources onto liquid PEG (MW = 600). The prepared NPs were alloyed with the face-centered cubic (fcc) structure. In addition, the particle sizes, composition, and shape are strongly correlated but can be tailored by an appropriate variation of the sputtering parameters. No individual particle but large agglomerates with partial alloy structure formed at Pt content of less than 16 atom %. Highly dispersed NPs with no agglomeration were observed in PEG when the quantity of Pt is more than 26 atom %. On the other hand, a small amount of Pt could terminate the agglomeration of Au when sputtering on the grids for transmission electron microscope observation. Our experiment and computer simulation carried out by two different methods indicate that the composition-dependent particle size of Pt/Au can be explained by the atomic concentration, formation energy of the cluster, and interaction between different metal atoms and the PEG molecule.
通过室温下从两个独立的磁控管源同时溅射沉积到液体聚乙二醇（MW = 600）上，合成了宽组成范围内的铂/金合金纳米颗粒（NPs）。制备的纳米颗粒具有面心立方（fcc）结构的合金。此外，颗粒尺寸、组成和形状密切相关，但可以通过适当改变溅射参数来调整。当铂含量低于16原子%时，没有形成单个颗粒，而是形成了具有部分合金结构的大团聚体。当铂的含量超过26原子%时，在聚乙二醇中观察到高度分散且无团聚的纳米颗粒。另一方面，在用于透射电子显微镜观察的栅格上溅射时，少量的铂可以终止金的团聚。我们通过两种不同方法进行的实验和计算机模拟表明，铂/金颗粒尺寸与组成的关系可以用原子浓度、团簇形成能以及不同金属原子与聚乙二醇分子之间的相互作用来解释。
