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We report contact potential difference (CPD) measurements of n-alkanethiol self-assembling monolayers (SAMs) adsorbed to Au substrates using an organomercaptan-modified Au probe. We perform experiments by applying a triangular-sweep voltage between the sample and probe while measuring the resulting electrostatic force. The interfacial force microscope permits us to keep the probe/sample distance rigidly fixed, which allows us to directly measure theelectrostatic forceat aconstantdoi:10.1021/j100068a002 fatcat:kzlrh7poqjcqnjtt2lxbaqpvoi