Benzene- and anthracene-mediated assembly of gold nanoparticles at the liquid-liquid interface
Benzene- and anthracene-mediated assembly of gold nanoparticles at the liquid-liquid interface
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DOI：
10.1021/la025827g
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发表时间：
2002-08-20
期刊：
影响因子：
3.9
通讯作者：
Sastry, M
中科院分区：
文献类型：
--
作者：
Kumar, A;Mandal, S;Sastry, M
描述了金溶胶与苯以及氯仿中蒽的液-液界面上金纳米粒子的组织。剧烈搅拌两相混合物，导致金纳米颗粒几乎完全从水相转移到苯相，随后金纳米颗粒在液-液界面组装。在氯仿中的蒽的情况下，金纳米颗粒直接在界面上组装，形成一个非常灵活的膜。在这两种情况下，在界面处形成的金纳米颗粒膜可以转移到不同的固体载体上，并通过一系列技术进行了分析。薄膜在大长度尺度上显示出合理的金纳米颗粒二维有序。研究发现，苯和蒽分子与金颗粒表面的强结合可能是通过芳香分子与纳米颗粒表面结合的Au+离子之间的阳离子- π相互作用，从而为金纳米颗粒的组装开辟了一条迄今为止尚未探索的途径。
The organization of gold nanoparticles at the liquid-liquid interface between the gold hydrosol and benzene as well as anthracene in chloroform is described. Vigorous stirring of the biphasic mixture results in almost complete transfer of the gold nanoparticles from the aqueous to the benzene phase and the subsequent assembly of the gold nanoparticles at the liquid-liquid interface. In the case of anthracene in chloroform, the gold nanoparticles assembled directly at the interface forming an extremely flexible membrane. The gold nanoparticle films formed at the interface in both cases could be transferred onto different solid supports and were analyzed by a host of techniques. The films show reasonable two-dimensional ordering of the gold nanoparticles over large length scales. It was observed that the benzene and anthracene molecules are strongly bound to the gold particle surface, presumably through cation-pi interactions between the aromatic molecules and nanoparticle surface-bound Au+ ions, thus opening up a hitherto unexplored avenue for the assembly of gold nanoparticles.