Transduction électrochimique non covalente sur monocouches auto-assemblées mixtes

Date du colloque : 05/2013</p

Transduction électrochimique de la reconnaissance de cations par des radicaux aminoxyles : influence de la distance éther couronne/sonde redox

Date du colloque : 06/2011</p

Transduction électrochimique de la complexation de cation sur surface

Date du colloque : 12/2013</p

Electrochemical transduction of cation recognition by crown ether nitroxide derivatives : influence of the distance between macrocycle/redox sensor

Date du colloque : 06/2011</p

Transduction électrochimique de capture de cations par des dérivés aminoxyles.

Date du colloque : 07/2011</p

Self-Assembled Monolayers prepared from alkanethiols or dialkyl disulfides on Au: evidence of influence of the anchoring group

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 FcC15SH and dialkyl disulfides FcC15SSC15Fc), showed significant differences between monolayers made from the two precursors. The recorded mass was almost 60 % more important with FcC15SH by comparison with FcC15SSC15Fc. 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

Phase segregation on electroactive self-assembled monolayers: a numerical approach for describing lateral interactions between redox centers

A numerical method is proposed in order to differentiate a random distribution from a phase segregation of redox centers on (mixed) SAMs. This approach is compared to Laviron’s interactions model and voltammetric data of nitroxylalkanethiolate SAMs

Electrochemical Transduction on Self-Assembled Monolayers: Are Covalent Links Essential?

Electrochemical transduction without covalent links between redox and complexant units in a complexing self-assembled monolayer has been established. The results demonstrate that transduction depends on the crown ether/ferrocene ratio and appears to be tunable