Electrochemically Induced Deposition of Thiol-Based Monolayers onto Closely Spaced Microelectrodes
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- 作者：Joseph Wang ; Mian Jiang ; A. M. Kawde ; and Ronen Polsky
- 刊名：Langmuir
- 出版年：2000
- 出版时间：December 12, 2000
- 年：2000
- 卷：16
- 期：25
- 页码：9687 - 9689
- 全文大小：200K
- 年卷期：v.16,no.25(December 12, 2000)
- ISSN：1520-5827
文摘
We report on an electrochemical protocol for the selective formation of self-assembled alkanethiolmonolayers on a given microelectrode in the presence of a nearby second one. The procedure relies on theaccelerated self-assembly of alkanethiols in ethanolic solutions under a cathodic polarization. Voltammetric"blocking" and electrochemical quartz crystal microbalance experiments, along with optical surface imaging,are used for demonstrating the selective electrochemisorption process. Using closely spaced electrodes(with 6 
m gaps), we demonstrate that only electrodes kept at negative potentials have been coated. Suchattractive behavior is attributed to the simultaneous cathodic removal of an inhibitory surface layer. Thehigh spatial resolution opens the way for localizing different reactive chemistries onto predeterminedlocations of sensor arrays.
m gaps), we demonstrate that only electrodes kept at negative potentials have been coated. Suchattractive behavior is attributed to the simultaneous cathodic removal of an inhibitory surface layer. Thehigh spatial resolution opens the way for localizing different reactive chemistries onto predeterminedlocations of sensor arrays.