Assessing the apparent effective thickness of alkanethiol self-assembled monolayers in different concentrations of Fe(CN)63-/Fe(CN)64- by ac impedance spectroscopy

被引：58

作者：

Cui, XL ^{[1
]}

Jiang, DL

Diao, P

Li, JX

Tong, RT

Wang, XK

机构：

[1] Hebei Normal Univ, Dept Chem, Shijiazhuang 050016, Hebei, Peoples R China

[2] Chinese Acad Sci, Inst Coal Chem, Taiyuan 030001, Shanxi, Peoples R China

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1999年 / 470卷 / 01期

关键词：

ac impedance spectroscopy; alkanethiol; apparent effective thickness; self-assembled monolayers; defects; electron tunneling;

D O I：

10.1016/S0022-0728(99)00201-6

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The concept of an apparent effective thickness of a self-assembled monolayer is established and assessed with the measurements of ac impedance spectroscopy in different concentrations of Fe(CN)(6)(3-)/Fe(CN)(6)(4-) by alkanethiol self-assembled monolayers on a gold electrode. The complex-plane impedance plots for SAMs in solution of various concentrations of Fe(CN)(6)(3-)/Fe(CN)(6)(4-) exhibit are shapes. The apparent resistance (R-2), obtained from the simulation, decreased with increasing concentration of the redox couples. It is determined that the apparent effective thickness of the SAMs is lower than the length of chain of the alkanethiol. Defect sites may exist at the alkanethiol monolayers. (C) 1999 Elsevier Science S.A. All rights reserved.

引用

页码：9 / 13

页数：5

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