Adsorption Dynamics and Self-Assembled L-cysteine on Au(100)

Christian Engelbrekt, Renat R. Nazmutdinov, Jiawei Yan, T. T. Zinkicheva, Bingwei Mao, Jens Ulstrup, Jingdong Zhang

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Abstract

As the only amino acid with a functional thiol group, L - cysteine offers a strong perspective both for binding to gold and other metals, and for gentle immobilization of biomolecules. Binding to single - crystal, atomically planar surfaces offers the additional perspective that bound L - cysteine can be structurally mapped at the single - molecule level . In this work, we have followed the adsorption of L - cysteine on single - crystal Au(100) by measuring the electrode potential dynamics during the adsorption process. In situ STM revealed the structure of the self - assembled ordered layers. The molecular assemblies were studied through simulated STM image contrast based on density functional theory (DFT) including solvation effects. The adsorption kinetics showed clearly a complex pattern with at least one intermediate state. The modelling disclosed details of the interaction of all functional groups with the Au(100) - substrate.
Original languageEnglish
Publication date2014
Publication statusPublished - 2014
Event65th Annual Meeting of the International Society of Electrochemistry - Lausanne, Switzerland
Duration: 31 Aug 20145 Sep 2014

Conference

Conference65th Annual Meeting of the International Society of Electrochemistry
Country/TerritorySwitzerland
CityLausanne
Period31/08/201405/09/2014

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