Impedance analysis of self-assembled naphthalene disulfide monolayer on gold using external redox probes

被引：43

作者：

Bandyopadhyay, K

Vijayamohanan, K ^{[1
]}

Shekhawat, GS

Gupta, RP

机构：

[1] Natl Chem Lab, Phys Mat Chem Div, Poona 411008, Maharashtra, India

[2] Cent Elect Engn Res Inst, Pilani 333031, Rajasthan, India

来源：

JOURNAL OF ELECTROANALYTICAL CHEMISTRY | 1998年 / 447卷 / 1-2期

关键词：

impedance analysis; naphthalene disulfide; gold; external redox probes; self-assembled monolayer;

D O I：

10.1016/S0022-0728(97)00491-9

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A self-assembled monolayer (SAM) of naphthalene disulfide (NDS) has been formed on a polycrystalline gold surface. Techniques like cyclic voltammetry and impedance measurement with an external redox probe along with scanning tunnelling microscopy (STM) are used to investigate the monolayer structure and ion permeation through it. Impedance analysis shows that the rare constant or a fast redox couple like Fe(CN)(6)(4-/3-) has decreased from 2.3 x 10(-2) to 9.4 x 10(-4) cm s(-1) due to the barrier provided by the monolayer. The STM image clearly shows the presence of defects (as pinholes) on the monolayer surface in agreement with the residual current observed in the voltammograms. (C) 1998 Elsevier Science S.A. All rights reserved.

引用

页码：11 / 16

页数：6

共 31 条

[1] CHARGE-TRANSFER AT PARTIALLY BLOCKED SURFACES - A MODEL FOR THE CASE OF MICROSCOPIC ACTIVE AND INACTIVE SITES [J].