Self-Assembly of Alkanethiols on an Oxide-Free Surface of a Copper Electrode from Alkaline Solutions under Electrochemical Control

S. N. Ovchinnikova; Овчинникова С. Н.; T. P. Alexandrova; Александрова Т. П.

doi:10.31857/S004418562370081X

Self-Assembly of Alkanethiols on an Oxide-Free Surface of a Copper Electrode from Alkaline Solutions under Electrochemical Control

Authors: Ovchinnikova S.N.¹, Alexandrova T.P.¹^,2
Affiliations:
1. Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences
2. Novosibirsk State Technical University
Issue: Vol 59, No 6 (2023)
Pages: 657-664
Section: НАНОРАЗМЕРНЫЕ И НАНОСТРУКТУРИРОВАННЫЕ МАТЕРИАЛЫ И ПОКРЫТИЯ
URL: https://journals.rcsi.science/0044-1856/article/view/233791
DOI: https://doi.org/10.31857/S004418562370081X
EDN: https://elibrary.ru/ABRKYD
ID: 233791

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Abstract
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Abstract

Using voltammetry and chronoamperometry, the formation process and properties of insulating nanofilms of alkanethiols with different chain lengths (butane-, octane-, dodecanethiol) obtained on an oxide-free copper surface were studied. The electrochemical method for modifying the copper surface includes the removal of the oxide layer by its cathodic reduction, the adsorption of a thiol under electrochemical control, followed by studying the properties of the resulting nanofilm by voltammetry in one solution. It is shown that, with this approach, a dense thiol film is formed, with its blocking properties depending on the adsorption potential, the time of contact of the electrode with the thiol-containing solution, the thiol concentration, and the presence of dissolved oxygen in the solution. The introduction of ethanol into an aqueous alkali solution leads to a significant acceleration of the process of self-assembly of dodecanethiol, but greatly inhibits the process of self-assembly of butanethiol. The approach proposed in this work makes it possible to use aerated low-concentration thiol-containing solutions to obtain alkanethiol films on the Cu surface with good blocking properties.

Keywords

copper, alkanethiols, self-assembly, adsorption, cyclic voltammetry, ethanol

About the authors

S. N. Ovchinnikova

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences

Email: ovchin@solid.nsc.ru
630128, Novosibirsk, Russia

T. P. Alexandrova

Institute of Solid State Chemistry and Mechanochemistry, Siberian Branch, Russian Academy of Sciences; Novosibirsk State Technical University

Author for correspondence.
Email: taleks99@mail.ru
630128, Novosibirsk, Russia; 630073, Novosibirsk, Russia

References

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