Capacitive study of self-assembled alkylthiol monolayers: Surface charge effects and kinetics of surfactants adsorption

被引：5
|
作者：
Schweiss, R [1 ]
Mirsky, VM [1 ]
Wolfbeis, OS [1 ]
机构：
[1] Univ Regensburg, Inst Analyt Chem Chemo & Biosensors, D-93040 Regensburg, Germany
来源：
TRENDS AND NEW APPLICATIONS OF THIN FILMS | 1998年 / 287-2卷
关键词：
surfactant; adsorption; self-assembly; capacitance; surface charge;
D O I：
10.4028/www.scientific.net/MSF.287-288.427
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Adsorption and desorption kinetics of different surfactants onto/from the surface of gold electrodes covered by self-assembled monolayers of 1-octadecanethiol were monitored in aqueous solutions by means of capacitive measurements. Effects of temperature, surfactant concentration and of the surfactants hydrophobic chain length were studied. A linear dependence between the initial slope of the adsorption kinetics and surfactant concentration was observed. This effect can be used for analytical determination of surfactants. The adsorption kinetics suggests a fractal geometry of the surfactants adsorption. The influence of pH and ionic strength on the capacitance of gold electrodes covered by omega-terminated alkylthiols was studied. The curves obtained depend on the ionic strength and have minima near the pK of the terminal group.
引用
收藏
页码：427 / 430
页数：4
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