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  Carbon-Sulfur Bond Cleavage During Adsorption of Octadecane Thiol to Copper in Ethanol

Rechmann, J., Krzywiecki, M., & Erbe, A. (2019). Carbon-Sulfur Bond Cleavage During Adsorption of Octadecane Thiol to Copper in Ethanol. Langmuir, 35(21), 6888-6897. doi:10.1021/acs.langmuir.9b00686.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0003-C206-B Version Permalink: http://hdl.handle.net/21.11116/0000-0003-C20D-4
Genre: Journal Article

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 Creators:
Rechmann, Julian1, Author              
Krzywiecki, Maciej2, Author              
Erbe, Andreas1, 3, Author              
Affiliations:
1Interface Spectroscopy, Interface Chemistry and Surface Engineering, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society, ou_1863358              
2Institute of Physics – CSE, Silesian University of Technology, B. Krzywoustego 2, 44–100 Gliwice, Poland, ou_persistent22              
3Department of Materials Science and Engineering, NTNU - Norwegian University of Science and Technology, 7491 Trondheim, Norway, ou_persistent22              

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 Abstract: The effect of the solvent on the formation ofthiol self-assembled monolayers (SAMs) on oxide-covered,reactive metals is more involved than in the well-studied gold−thiol system. In this work, copper covered with a native oxidewas modified with 1-octadecanethiol (ODT) in eithertetrahydrofuran or ethanol. Infrared spectroscopy indicatedthe formation of crystalline chain packing of alkyl chains fromboth solvents. Surface coverage was approximately equal inboth systems, with differences in tilt angles of the chains. Adetailed analysis by X-ray photoelectron spectroscopy showedthe formation of Cu2S and copper-bound carbon when theadsorption was carried out in ethanol. This observation can beexplained by the cleavage of the C−S bond in ODT duringadsorption. Based on the analogy of preparations, we reasonthat the solvation of ODT in ethanol must be such that it weakens the C−S bond in ODT, thus enabling the cleavage of thisbond. Based on the evidence presented here, it is not possible to distinguish between surface solvation and bulk solvation.Electrochemical linear sweep voltammetry shows that SAMs from both solvents have an enhancing protective effect comparedto the native oxide layer. The results from this work show interesting possibilities for the preparation of adsorbed monolayerswith chemical interaction to reactive metals, with some similarities to carbene-based SAMs.

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Language(s): eng - English
 Dates: 2019-05-03
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1021/acs.langmuir.9b00686
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Title: Langmuir
  Abbreviation : Langmuir
Source Genre: Journal
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Publ. Info: Columbus, OH : American Chemical Society
Pages: - Volume / Issue: 35 (21) Sequence Number: - Start / End Page: 6888 - 6897 Identifier: ISSN: 0743-7463
CoNE: https://pure.mpg.de/cone/journals/resource/954925541194