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Atomic Force Microscope (AFM) assisted nanografting was exploited to construct—in a liquid—well-defined nanoscale patches of amino- and carboxyl-terminated alkanethiols in a SAM matrix on an atomically flat gold (Au(111)) surface. By means of AFM the nanografted patches of these thiols were studied in detail by a combination of height and quantitative lateral friction measurements. The functionalized thiols form well-ordered self-assembled bilayers, with uniformly oriented and packed molecules, consisting of a first layer adsorbed to the gold surface via thiol–gold bonds, and a second layer stably bound to the first via COOH–HOOC or NH2–H2N intermolecular hydrogen bonds.

AFM topography and friction studies of hydrogen-bonded bilayers of functionalized alkanethiols