Potential-induced defects in n-alkanethiol self-assembled monolayers monitored by impedance spectroscopy

被引：145

作者：

Boubour, E ^{[1
]}

Lennox, RB ^{[1
]}

机构：

[1] McGill Univ, Dept Chem, Montreal, PQ H3A 2K6, Canada

来源：

JOURNAL OF PHYSICAL CHEMISTRY B | 2000年 / 104卷 / 38期

关键词：

D O I：

10.1021/jp000151o

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：

The ionic permeability of alkanethiol self-assembled monolayers (SAMs) chemisorbed on gold is studied using ac impedance spectroscopy in the absence of redox active species. CH3(CH2)(n)S/Au (n = 7-15) SAMs behave as ionic insulators until a critical potential, V-c, is reached or exceeded. At potentials more cathodic than V-c, SAMs are no longer ionic insulators and a significant change in the phase angle is associated with ion penetration in the low-frequency region. Ve is chain length dependent and is observed at potentials (-0.15 to -0.35 V vs Ag/AgCl) that are considerably more anodic than the alkanethiol electrodesorption potential. The relaxation frequency of trans-SAM ion migration (4-100 Hz) can be calculated from fitting of the impedance data to an appropriate equivalent circuit or from Bode phase plots.

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页码：9004 / 9010

页数：7

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