Article (Scientific journals)
Electrochemical and spectroscopic study of the self-assembling mechanism of normal and chelating alkanethiols on copper
Dilimon, V. S.; Denayer, Jessica; Delhalle, J. et al.
2012In Langmuir, 28 (17), p. 6857-6865
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Keywords :
Aliphatic thiols; Alkanethiols; Dithiocarboxylic acids; Dithiols; EIS studies; Electrochemical impedance spectroscopies (EIS); Ex situ; In-situ; Linear sweep voltammetry; Oxide reduction; PM-IRRAS; Polarization modulation infrared reflection absorption spectroscopy; Real time; Sams; Self-assembling; Spectroscopic studies; Adsorption; Electrochemical impedance spectroscopy; Monolayers; Photoelectrons; Self assembly; Spectroscopic analysis; Sulfur; X ray photoelectron spectroscopy; Copper
Abstract :
[en] The self-assembly of aliphatic thiol (RSH), dithiol (R(SH) 2), and dithiocarboxylic acid (RS 2H) onto mildly oxidized and highly oxidized copper was studied in real time by in situ electrochemical impedance spectroscopy (EIS). Ex situ characterization of the films was carried out using linear sweep voltammetry (LSV), polarization modulation infrared reflection absorption spectroscopy (PM-IRRAS), and X-ray photoelectron spectroscopy (XPS). In situ EIS studies found a very fast adsorption of RSH, R(SH) 2, and RS 2H (within 10-15 s). This fast adsorption step is followed by the long-term additional adsorption and consolidation of SAM. However, the self-assembly of RS 2H passes through an intermediate step of molecule rearrangement for around 10 to 30 min after around 2 to 7 min of self-assembly. The binding of both sulfur moieties of R(SH) 2 with Cu happens simultaneous. The oxide reduction capacity of RSH, R(SH) 2, and RS 2H was good. However, the XPS studies showed the decomposition of RS 2H-based SAMs to Cu 2S. Monolayers prepared on both mildly oxidized and heavily oxidized Cu with R(SH) 2 had the highest stability. Monolayers of RS 2H showed the least stability on both mildly oxidized and heavily oxidized Cu. Although RSH-based SAMs had good organization on both mildly oxidized and highly oxidized Cu, R(SH) 2-based SAMs did not show good organization in either case. The RS 2H monolayer had good organization only on mildly oxidized Cu. © 2012 American Chemical Society.
Disciplines :
Chemistry
Author, co-author :
Dilimon, V. S.;  Laboratory of Chemistry and Electrochemistry of Surfaces, FUNDP-University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
Denayer, Jessica ;  Université de Liège - ULiège > Département de chimie (sciences) > LCIS - GreenMAT
Delhalle, J.;  Laboratory of Chemistry and Electrochemistry of Surfaces, FUNDP-University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
Mekhalif, Z.;  Laboratory of Chemistry and Electrochemistry of Surfaces, FUNDP-University of Namur, Rue de Bruxelles 61, B-5000 Namur, Belgium
Language :
English
Title :
Electrochemical and spectroscopic study of the self-assembling mechanism of normal and chelating alkanethiols on copper
Publication date :
2012
Journal title :
Langmuir
ISSN :
0743-7463
eISSN :
1520-5827
Publisher :
American Chemical Society, Washington, United States - District of Columbia
Volume :
28
Issue :
17
Pages :
6857-6865
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 14 February 2013

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