Real time monitoring of the electrochemical transformation of a ferrocene-terminated alkanethiolate monolayer at gold via an adhesion-based atomic force microscopic characterization

被引:49
作者
Green, JBD
McDermott, MT
Porter, MD
机构
[1] IOWA STATE UNIV SCI & TECHNOL, US DOE, AMES LAB, MICROANA INST CTR, AMES, IA 50011 USA
[2] IOWA STATE UNIV, DEPT CHEM, AMES, IA 50011 USA
关键词
D O I
10.1021/jp9610527
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
This paper demonstrates the real lime monitoring of the electrochemical transformation of a surface-bound redox species using AFM-based adhesion measurements, The measurements were conducted using a monolayer formed by the chemisorption of 11-mercaptoundecyl ferrocenecarboxylate (FcT) at a Au(111) electrode and a gold-coated probe tip modified with an octadecanethiolate (OT) monolayer. Using this probe tip-sample combination, the one-electron oxidation of the ferrocenyl group of the FcT monolayer results in a decrease in the observed force of adhesion (F-ad) at the microcontact formed by the two different surfaces. Using surface tension arguments, this change is attributed to the decrease in the effective miscibility at the microcontact as a consequence of the oxidation of the ferrocenyl group to the ferrocenium ion. Issues related to the underlying changes in the interfacial structure that give rise to the differences in F-ad are discussed.
引用
收藏
页码:13342 / 13345
页数:4
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