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Selective Penetration of Metal Atoms — New Evidence and Application for the Simple Ideal Penetration Model of the Long-Chain Close-Packed Alkanethiol Self-Assembled Monolayers on Au(111)

By Jianyuan Dai, Jing Jin, Haiqiong Zhang and Shuping Bi

Abstract

AbstractIn the study of the vapor deposition of metal atoms onto long-chain alkanethiol self-assembled monolayers (CnSH-SAMs, n>10) on Au(111) substrate, metal atoms with different diameters can penetrate selectively into the CnSH-SAMs or not, which looks like the “size exclusion effect”. In this paper, we proposed a new mechanism for the metal atoms penetration by establishing a simple ideal penetration model of the long-chain CnSH-SAMs with defect-free structure on Au(111). The intrinsic and regular–distributed channels with ∼ 3Å diameters (which are decided by the framework size of the three-aggregate of the CnSH molecules) were deduced. This new penetration mechanism can explain reasonably the selective penetration of metal atoms into the long-chain CnSH-SAMs on Au(111): When the driving force is applied, the metal atoms with diameter smaller than 3Å will overcome the van der Waals interaction among the neighboring hydrocarbon chains and penetrate into the CnSH-SAMs through the ∼ 3Å channels reaching to the surface of Au(111), while the metal atoms with large diameter (> 3Å) can not penetrate

Publisher: Published by Elsevier B.V.
Year: 2012
DOI identifier: 10.1016/j.phpro.2012.03.542
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