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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Surface Modification of Au Nanoparticles with Heteroleptic Cu(I) Diimine Complexes
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Surface Modification of Au Nanoparticles with Heteroleptic Cu(I) Diimine Complexes

机译：用异氟（I）二亚胺配合物的Au纳米粒子的表面改性

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摘要

Gold colloidal nanoparticles (NPs) were functionalized in acetonitrile with a Cu(I) complex consisting of one 2,2'-bipyridine ligand possessing a lipoic acid moiety and one 2,9-dimesitylene-1,10-phenanthroline. UV electronic absorption, inductively coupled plasma-atomic emission spectroscopy, and scanning transmission electron microscopy with energy-dispersive X-ray analysis specifically targeting the Cu element were employed to confirm the grafting of the metallic complex on the Au NPs via Au-S bond formation and to probe its surface distribution and surface coverage. At the highest coverage achieved while retaining nanoparticle dispersibility, we estimate the molecular footprint of the complex at 0.71 nm(2), corresponding to similar to 7000 molecules over a 40 nm spherical particle. This is only four time less than what is reported for much smaller alkanethiols forming a compact self-assembled monolayer on similar gold nanoparticles. In the surface-enhanced Raman spectra (SERS), we underline a convenient marker band at similar to 1000 cm(-1); its frequency position is indicative of the complexation state of the surface-bound bipyridine molecules. From the analysis of the normal Raman spectra of the powders and the SERS data, the anchored tetrahedral complex is presumed to orient with the two polycyclic ligands predominantly normal to the surface and the most cumbersome substituted phenanthroline more peripherally placed.
机译：金胶体纳米颗粒（NP）的乙腈溶液中官能化具有Cu（I）配合物由一种2,2'-联吡啶配体具有硫辛酸部分和一个2,9- dimesitylene -1,10-菲咯啉。 UV电子吸收，电感耦合等离子体 - 原子发射光谱法，和扫描透射电子显微镜能量分散X射线分析为了确认的金属络合物上的金纳米粒子通过的Au-S键形成接枝特异性靶向Cu元素并探讨其表面分布和表面覆盖。在同时保持纳米颗粒的分散性达到的最高报道，我们估计络合物的分子足迹0.71纳米（2），在40纳米的球形颗粒对应于类似于7000点的分子。这比什么报道小得多烷基硫醇形成类似的金纳米粒子的紧凑自组装单分子仅少四个时间。在表面增强拉曼光谱（SERS），我们在强调类似方便的标记带1000厘米（-1）;其频率位置是指示所述表面结合的联吡啶分子的络合状态。从粉末和SERS数据的正常拉曼光谱的分析中，锚定的四面体络合物推测定向与两个多环配体主要垂直于表面和最麻烦的取代的菲咯啉更多周边放置。

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