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Kelvin Probe Force Microscopy in Nonpolar Liquids

Work function changes of Au were measured by Kelvin probe force microscopy (KPFM) in the nonpolar liquid decane. As a proof of principle for the measurement in liquids, we investigated the work function change of an Au substrate upon hexadecanethiol chemisorption. To relate the measured contact potential difference (CPD) during the chemisorption of alkanethiols to a change of the work function, the influence of physisorbed decane must be taken into account. It is crucial that either the work function of the scanning probe microscope (SPM) tip or the sample surface remains constant throughout the reaction, since both contribute to the CPD. We describe two routes for determining the work function shift of Au coated with a monolayer of alkanethiols: In the first route, the SPM tips were taken as reference surfaces (constant tip work function). For this approach, we used Au(111) surfaces and kept the SPM tip ex situ during the adsorption process. In the second route, structured surfaces with reactive and iner...

Authors:   Anna L. Domanski; Esha Sengupta; Karina Bley; Maria B. Untch; Stefan A. L. Weber; Katharina Landfester; Clemens K. Weiss; Hans-Jürgen Butt; Rüdiger Berger
Journal:   Langmuir
Year:   2012
DOI:   10.1021/la302451h
Publication date:   18-Sep-2012
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