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  • Title: Effect of nanometer surface morphology on surface stress and adsorption kinetics of alkanethiol self-assembled monolayers.
    Author: Desikan R, Lee I, Thundat T.
    Journal: Ultramicroscopy; 2006; 106(8-9):795-9. PubMed ID: 16678968.
    Abstract:
    Microcantilevers undergo quasi-static bending due to adsorption-induced stress when adsorption is confined to a single surface. Understanding the origin of surface stress is crucial for optimizing sensor performance. We have investigated the effect of surface morphology of gold-coated cantilevers on the adsorption characteristics of self-assembled monolayers of alkanethiols. Self-assembly of alkanethiols from liquid phase closely follows Langmuir-type kinetics up to a single monolayer assembly. Our results indicate that alkanethiol adsorption-induced surface stress is largely unaffected by surface roughness of the cantilever. Unlike prior reports that suggest surface roughness enhances adsorption-induced stress, we observe that nanometer-size roughness slightly decreases surface stress and adsorption kinetics.
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