Novel acidic or basic aryl-alkyl disulfides having phenol, benzoic acid, benzenesulfonic acid, aniline, and benzylamine groups were synthesized as protective agents for gold (Au) nanoparticles. Monodisperse Au nanoparticles passivated by these ligands were prepared using a chemical reduction technique, and self-assembled into well-ordered hexagonal close-packed (hcp) 2D superlattices on the substrate. We also present, for the first time, the formation of an aggregated multilayer of Au nanoparticles at a water–organic solvent interface by mixing separately synthesized acidic and basic Au nanoparticles. This film was definitely different from those obtained by the LB method and the conventional self-assembly method through solvent evaporation.
合成了新的酸性或碱性芳基-烷基二
硫化物,具有
酚、
苯甲酸、
苯磺酸、
苯胺和
苄胺基团,作为
金(Au)纳米颗粒的保护剂。使用
化学还原技术制备了被这些
配体钝化的单分散Au纳米颗粒,并在基底上自组装成具有良好有序的六方紧密堆积(hcp)二维超晶格。我们首次展示了通过混合分别合成的酸性和碱性Au纳米颗粒,在
水-有机溶剂界面形成的聚集多层Au纳米颗粒。这种薄膜与LB法和通过溶剂蒸发的传统自组装法获得的薄膜明显不同。