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Biosens Bioelectron. 2009 Jan 1;24(5):1074-82. doi: 10.1016/j.bios.2008.08.034. Epub 2008 Aug 28.

Some thoughts on the existence of ion and water channels in highly dense and well-ordered CH3-terminated alkanethiol self-assembled monolayers on gold.

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  • 1School of Chemistry and Chemical Engineering, State Key Laboratory of Coordination Chemistry of China & Key Laboratory of MOE for Life Science, Nanjing University, Nanjing 210093, China.

Abstract

Through extensive and systematic reviewing of literatures, this paper presents some thoughts on the existence of ion and water channels in highly dense and well-ordered CH(3)-terminated alkanethiol self-assembled monolayers (C(n)SH-SAMs) on gold: (1) based on the combinational effect of "the van der Waals interaction between the neighbor hydrocarbon chains", "the framework size of C(n)SH molecule" and "the surface lattice structure of C(n)SH-SAMs on gold", a simple ideal model of the close-packed C(n)SH-SAMs is proposed for the first time. The channel with an appropriate diameter of about 3A ( approximately 3A) existing in SAMs on Au is deduced, which is found large enough for ions and water molecules to permeate; (2) through summarizing the literature reports for various experiments (e.g. scan microscopy techniques and electrochemical methods, etc.), the existence of the ion and water channels ( approximately 3A) in close-packed C(n)SH-SAMs is verified; (3) furthermore, the effect of the ions and water molecules permeation on the studies of the SAMs' electron tunneling process is discussed. This simple ideal model of the close-packed C(n)SH-SAMs established by us may clarify the controversies about the permeation mechanism of ions and water molecules in C(n)SH-SAMs.

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