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首页> 外文期刊>Journal of Electroanalytical Chemistry: An International Journal Devoted to All Aspects of Electrode Kinetics, Interfacial Structure, Properties of Electrolytes, Colloid and Biological Electrochemistry >Electrochemical impedance spectroscopy study of mixed thiol monolayers on gold
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Electrochemical impedance spectroscopy study of mixed thiol monolayers on gold

机译：金上混合硫醇单层的电化学阻抗谱研究

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摘要

We demonstrate how electrochemical impedance spectroscopy (EIS) measurement of the capacitance can be used to calculate the composition of mixed self assembled monolayers (SAMs) consisting of binary mixtures of octanethiol (OTT) with hexadecanethiol (HDT) and dodecanethiol (DDT) with 11-mercaptoundecanoic acid (MUA) on gold. We monitor as a function of immersion time changes in composition of the mixed SAM and examine the displacement of one thiol in a SAM with another thiol from solution. Under the experimental conditions the composition of the mixed SAM formed by co-adsorption from a mixture of thiols in solution is determined by thermodynamic, not kinetic, factors given sufficiently long immersion times (up to 10 days). Fully formed SAM consisting of a single component behave differently in that some pure SAM (e.g., DDT) are completely displaced when exposed to a competing thiol in solution, whereas others (e.g., MUA) can only be partially displaced, presumably because of strong interlayer cohesion between the carboxylate end groups. (C) 2005 Elsevier B.V. All rights reserved.
机译：我们展示了如何通过电容的电化学阻抗谱（EIS）测量来计算由11-黄金上的巯基十一烷酸（MUA）。我们根据浸没时间的变化监测混合SAM的组成，并检查溶液中一种硫醇与另一种硫醇在SAM中的置换。在实验条件下，由溶液中的硫醇混合物共吸附形成的混合SAM的组成是由热力学而非动力学因素决定的，这些因素应给予足够长的浸泡时间（最多10天）。由单个组分组成的完全形成的SAM的行为不同，因为某些纯SAM（例如DDT）在溶液中暴露于竞争的硫醇时会被完全置换，而其他一些（例如MUA）只能被部分置换，这可能是因为中间层牢固羧酸根端基之间的内聚力。 （C）2005 Elsevier B.V.保留所有权利。

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