Role of Salt in the Spontaneous Assembly of Charged Gold Nanoparticles in Ethanol
Role of Salt in the Spontaneous Assembly of Charged Gold Nanoparticles in Ethanol
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DOI：
10.1021/la200459t
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发表时间：
2011-05-03
期刊：
影响因子：
3.9
通讯作者：
Yin, Yadong
中科院分区：
文献类型：
--
作者：
Han, Xiaogang;Goebl, James;Yin, Yadong
本文研究了盐在带电金纳米粒子在乙醇中自发线性组装过程中的作用，并试图澄清人们对乙醇在此过程中作用的误解。许多先前的报道已经注意到，将乙醇添加到金纳米颗粒的水溶液中导致它们聚集成线性组装体。因此，据信乙醇在组装过程中起决定性作用。在这项工作中，我们进行了系统的研究表明，残留的盐与乙醇，而不是乙醇本身，诱导组装的金纳米粒子在乙醇中。在不存在盐的情况下，金纳米颗粒可以很好地分散在乙醇溶液中。此外，我们发现，链状组件可以分解后，稀释的盐或乙醇的蒸发，如果金纳米粒子的保护与足够强的配体。
This paper investigates the role of salt in the spontaneous linear assembly of charged gold nanoparticles in ethanol and attempts to clear up a misunderstanding on the role of ethanol in this process. Many prior reports have noted that the addition of ethanol to an aqueous solution of gold nanoparticles causes their aggregation into linear assemblies. It was therefore believed that ethanol plays the determining role during the assembly process. In this work, we carried out systematic studies which indicate that residual salt in conjunction with ethanol, instead of ethanol itself, induces the assembly of gold nanoparticles in ethanol. In the absence of salt, gold nanoparticles can be well dispersed in an ethanol solution. Furthermore, we find that the chainlike assemblies can disassemble upon dilution of the salt or the evaporation of ethanol if the gold nanoparticles are protected with a sufficiently strong ligand.