Jump to main content
Jump to site search

Issue 33, 2012
Previous Article Next Article

A procedure for estimating the surface dipole potential of monolayers adsorbed on electrodes

Author affiliations

Abstract

The extrathermodynamic potential difference Δϕ across an electrified interface enclosed between a bulk metal M and a bulk aqueous phase does not depend on the content of the interface, at constant applied potential E. By equating at constant E the expression of Δϕ for an electrode coated by a self-assembled monolayer (SAM) to that for the corresponding bare electrode immersed in the aqueous solution of a nonspecifically adsorbed electrolyte, it is possible to estimate the surface dipole potential χSAM of the SAM. If the molecules of the SAM form a bond M–X with the metal M, this procedure requires an independent knowledge of the surface dipole potential χM–XSAM due to such a bond. The other way round, if the χSAM value is known by independent means, the procedure allows an estimate of χM–XSAM. The self-consistency of this procedure was tested with SAMs of ten different thiolated peptides covalently bound to a mercury electrode, where χSAM can be determined independently by expanding a mercury drop. The procedure was then applied to the estimate of the χSAM value of a peptide SAM on a polycrystalline gold electrode.

Graphical abstract: A procedure for estimating the surface dipole potential of monolayers adsorbed on electrodes

Back to tab navigation

Publication details

The article was received on 07 May 2012, accepted on 21 Jun 2012 and first published on 11 Jul 2012


Article type: Paper
DOI: 10.1039/C2SM26058A
Soft Matter, 2012,8, 8601-8607

  •   Request permissions

    A procedure for estimating the surface dipole potential of monolayers adsorbed on electrodes

    L. Becucci, I. Guryanov, F. Maran, F. Scaletti and R. Guidelli, Soft Matter, 2012, 8, 8601
    DOI: 10.1039/C2SM26058A

Search articles by author

Spotlight

Advertisements