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Self‐Assembled Monolayers prepared from alkanethiols or dialkyl disulfides on Au: evidence of influence of the anchoring group.
Author(s) -
Blanchard PierreYves,
Kenfack Ghislain Tsague,
Levillain Eric,
Gautier Christelle
Publication year - 2016
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201600071
Subject(s) - monolayer , quartz crystal microbalance , anchoring , ferrocene , moiety , chemistry , self assembled monolayer , thiol , disulfide bond , electrochemistry , adsorption , polymer chemistry , organic chemistry , electrode , biochemistry , structural engineering , engineering
Mainly based on electrochemical investigations, this work provides evidence of discrimination between self‐assembled monolayers (SAMs) prepared from alkanethiols or symmetrical dialkyl disulfides on gold. Gravimetric experiments carried out by quartz crystal microbalance during the elaboration of ferrocene based SAMs (from alkanethiols FcC 15 SH and dialkyl disulfides FcC 15 SSC 15 Fc), showed significant differences between monolayers made from the two precursors. The recorded mass was almost 60 % more important with FcC 15 SH by comparison with FcC 15 SSC 15 Fc. The resulting cyclic voltammograms also highlighted a 60 % difference concerning the surface coverage of ferrocene heads. Moreover, dialkyl disulfide and thiol anchoring groups led to symmetrical and dissymmetrical peaks, respectively, suggesting not insignificant differences concerning interactions between adsorbed species into the two kinds of elaborated monolayers. These observations were confirmed on SAMs obtained from other precursors possessing shorter chain length or another functional moiety.