Thiol-terminated Di-, Tri-, and tetraethylene oxide functionalized gold nanoparticles: A water-soluble, charge-neutral cluster

被引:122
作者
Foos, EE [1 ]
Snow, AW [1 ]
Twigg, ME [1 ]
Ancona, MG [1 ]
机构
[1] USN, Res Lab, Washington, DC 20375 USA
关键词
D O I
10.1021/cm020007a
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A series of gold nanoclusters stabilized by ligands containing short ethylene oxide oligomers of fixed length were prepared and characterized. The thiols CH3(OCH2CH2)(n)SH (where n = 2, 3, and 4) were substituted onto the surface of 1.8-nm hexanethiol-capped gold clusters by a thiol-exchange reaction, and the resulting nanoclusters were characterized by NMR, FTIR, and UV/vis spectroscopies; TGA; and TEM analysis. A degree of ligand exchange greater than 99% was achieved, and the gold core diameter remained unchanged in the final material. Of particular interest, the cluster with n = 2 was water-insoluble, whereas those with n = 3 or 4 were water-soluble. The thin-film electrical conductivities of these clusters were compared with those of alkanethiol-capped clusters of similar chain lengths and found to be roughly 1 order of magnitude greater. In a chemical vapor sensor configuration, this series of clusters displayed strong electrical responses that showed a correlation between the length of the ethylene oxide ligand and the polarity of the vapor.
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收藏
页码:2401 / 2408
页数:8
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