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Synthesis and self-organization of Au nanoparticles

机译:金纳米粒子的合成与自组织

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Monodisperse (diameter 10 nm) Au nanoparticles have been synthesized by the reduction of AuCl3 at high temperatures, in commercial oleyl amine, in the presence of tri-octyl phosphine oxide (TOPO). The oleyl amine molecule has multiple roles, acting as high-boiling-point solvent, capping agent and reducing agent. The Au nanocrystalline particles have been studied by powder x-ray diffraction (XRD) and transmission electron microscopy (TEM). The nanoparticles can disperse well in non-polar solvents such as hexane, toluene and chloroform. The as-received Au nanoparticles, capped with the alkylamine-TOPO molecules, form two-dimensional superlattices via solvent evaporation. Moreover, they can be converted into a water-soluble derivative via a simple procedure based on the formation of a physisorbed layer of an ionic (cationic or anionic) surfactant around the capped surface. The charged particles can assemble in aqueous solution into three-dimensional structures via electrostatic interactions.
机译:在三油基氧化膦(TOPO)存在下,在市售油胺中通过高温还原AuCl3合成了单分散(直径为10 nm)的Au纳米颗粒。油胺分子具有多种作用,起着高沸点溶剂,封端剂和还原剂的作用。已经通过粉末X射线衍射(XRD)和透射电子显微镜(TEM)研究了Au纳米晶体颗粒。纳米颗粒可以很好地分散在非极性溶剂中,例如己烷,甲苯和氯仿。接收到的被烷基胺-TOPO分子封端的金纳米颗粒通过溶剂蒸发形成二维超晶格。而且,可以基于在封端表面周围形成离子(阳离子或阴离子)表面活性剂的物理吸附层,通过简单的程序将它们转化为水溶性衍生物。带电粒子可以通过静电相互作用在水溶液中组装成三维结构。

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