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首页> 外文期刊>Nanotechnology >A one-dimensional network from the self-assembly of gold nanoparticles by a necklace-like polyelectrolyte template mediated by metallic ion coordination
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A one-dimensional network from the self-assembly of gold nanoparticles by a necklace-like polyelectrolyte template mediated by metallic ion coordination

机译：由金属离子配位介导的项链状聚电解质模板自金纳米颗粒的自组装形成一维网络

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摘要

A new approach to one-dimensional organization of gold nanoparticles (2-4 nm) is described, using poly(4-vinylpyridine) (P4VP) molecular chain as a template with the mediation of free Cu~(2+) ion coordination. The assembly was conducted on freshly prepared mica surfaces and in aqueous solution, respectively. The surface assembly was characterized by tapping mode atomic force microscopy (AFM), observing the physisorbed molecules in their chain-like conformation with an average height of 0.4 nm. By the mediation of Cu~(2+) ions, gold nanoparticles modified by 3-mercaptopropionic acid were deposited onto the molecular chains, evidenced by a clear increase in height. Generation of the network in solution is time-dependent and pH reversible, characterized by UV—vis absorption spectra and transmission electron microscopy (TEM). No comparable network is obtained without Cu~(2+) ions, indicating the significance of ionic mediation. A mechanism for the self-assembly in solution is proposed, and the nature of the mediation of Cu~(2+) ions was identified by x-ray photoelectron spectroscopy (XPS).
机译：描述了一种以聚（4-乙烯基吡啶）（P4VP）分子链为模板，以自由Cu〜（2+）离子配位为中介的金纳米颗粒（2-4 nm）一维组织的新方法。组装分别在新鲜制备的云母表面和水溶液中进行。通过敲击模式原子力显微镜（AFM）表征表面组件，观察到物理吸附的分子呈链状构型，平均高度为0.4 nm。通过Cu〜（2+）离子的介导，经3-巯基丙酸修饰的金纳米颗粒沉积在分子链上，高度明显增加。溶液中网络的生成是时间依赖性的，pH可逆，其特征在于紫外可见吸收光谱和透射电子显微镜（TEM）。如果没有Cu〜（2+）离子，则无法获得可比的网络，表明离子介导的重要性。提出了溶液中自组装的机理，并通过X射线光电子能谱（XPS）确定了Cu〜（2+）离子的介导性质。

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