Selective anodic desorption for assembly of different thiol monolayers on the individual electrodes of an array.

Selective anodic desorption for assembly of different thiol monolayers on the individual electrodes of an array.
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DOI:
10.1021/la8043363
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发表时间:
2009-06-02
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Chidsey CE
Chidsey CE
中科院分区:
其他
文献类型:
--
作者:
Collman JP;Hosseini A;Eberspacher TA;Chidsey CE

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The close proximity of two individually addressable electrodes in an interdigitated array provides a unique platform for electrochemical study of multi-catalytic processes. Here we report a “plug-and-play” approach to control the underlying self-assembled monolayer and the electroactive species on each individually addressable electrode of an interdigitated array. The method presented here uses selective anodic desorption of a monolayer from one of the individually addressable electrodes and rapid formation of a different self-assembled monolayer on the freshly cleaned electrode. We illustrate this strategy by introducing variations in the length of the linker to the electroactive species in the self-assembled monolayer, which determines the rate of electron transfer. In order to separate the assembly of the monolayer from the choice of the electroactive species we use CuI-catalyzed triazole formation (“click” chemistry) to covalently attach an acetylene-terminated electroactive species to an azide-terminated thiol monolayer selectively on each electrode. The resulting variations in the electron-transfer rate to surface-attached ferrocene and in the rate of catalytic oxidation of ascorbate by the ferrocenium/ferrocene couple demonstrate an application of this approach.
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