THEORETICAL STUDY ON ADSORBATE-INDUCED SURFACE STRESS IN THE SELF-ASSEMBLY OF ALKANETHIOLS ON GOLD

Rong Xie ()
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Rong Xie: School of Materials Science and Chemical Engineering, Anhui Institute of Architecture and Industry, Hefei 230022, P. R. China

Surface Review and Letters (SRL), 2009, vol. 16, issue 06, 807-814

Abstract: By using established statistical thermodynamic theory of adsorbate-induced surface stress of adsorption monolayer on metal surface, the surface stressΔgin the self-assembly of alkanethiols onAu(111)surface has been calculated. The quantitative relations of the surface stressΔgwith the lengthNof the alkyl chain of the molecule and with the coverage θ of molecules onAu(111)have been theoretically studied, respectively. The calculated results agree with Bergeret al.'s experiment. The qualitative discrepancy between the theory and experiment on the sign of the surface stress has been resolved. Among various components of the adsorbate–adsorbate interaction energies in the adlayer, the substrate-mediated interaction is significant for the adsorbate-induced surface stress, which shows that indirect contribution of the adsorption energy of alkanethiols through the substrate-mediated interaction is very important.

Keywords: Lattice gas model; self-assembled monolayers (SAMs); substrate-mediated interaction; surface stress (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09013359

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