Reversible potential-induced structural changes of alkanethiol monolayers on gold surfaces

被引：29

作者：

Darwish, Nadim ^{[1
,2
]}

Eggers, Paul K. ^{[1
]}

Ciampi, Simone ^{[1
]}

Zhang, Yi ^{[2
]}

Tong, Yujin ^{[2
]}

Ye, Shen ^{[2
]}

Paddon-Row, Michael N. ^{[1
]}

Gooding, J. Justin ^{[1
]}

机构：

[1] Univ New S Wales, Sch Chem, Sydney, NSW 2052, Australia

[2] Hokkaido Univ, Catalysis Res Ctr, Sapporo, Hokkaido 0010021, Japan

来源：

ELECTROCHEMISTRY COMMUNICATIONS | 2011年 / 13卷 / 05期

基金：

澳大利亚研究理事会;

关键词：

Alkanethiols; Self-assembled monolayers; Ionic permeability; Electrochemical impedance spectroscopy; In-situ infrared spectroscopy; SELF-ASSEMBLED MONOLAYERS; INDUCED STRUCTURE TRANSITIONS; IMPEDANCE SPECTROSCOPY; DOUBLE-LAYER; IONIC PERMEABILITY; ELECTRON-TRANSFER; ORIENTATION; STABILITY; AU(100); METAL;

D O I：

10.1016/j.elecom.2011.01.025

中图分类号：

O646 [电化学、电解、磁化学];

学科分类号：

081704 ;

摘要：

Electrochemical impedance spectroscopy and in-situ IR spectroscopy were employed to investigate potential-induced structural changes, and associated ionic permeability, of alkanethiol self-assembled monolayers (SAMs) deposited on gold surfaces. SAMs terminated with hydroxyl or methyl groups were investigated. It is shown that both SAMs are highly permeable to ions once the dc potential is increased above a value of approximately + 500 mV vs Ag/AgCl in a 0.1 M HClO(4) aqueous solution. At potentials more anodic than 500 mV, there exists a reversible change in the resistance and the capacitance of the SAMs. The change in the dielectric properties exhibits the same trend for both methyl and hydroxyl terminated SAMs and is accompanied with a structural change as confirmed using in-situ IR spectroscopy as a function of the applied potential. (C) 2011 Elsevier B.V. All rights reserved.

引用

页码：387 / 390

页数：4

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