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Commensurability and mobility in two-dimensional molecular patterns on graphite.

J P Rabe, S Buchholz

    Science (New York, N.Y.)
    |July 26, 1991
    PubMed
    Summary
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    Long-chain molecules like alkanes and alcohols form ordered 2D patterns on graphite. Scanning tunneling microscopy revealed how molecular orientation affects registry with the graphite surface.

    Area of Science:

    • Surface science
    • Materials science
    • Nanotechnology

    Background:

    • Understanding molecular self-assembly on surfaces is crucial for designing advanced materials.
    • Graphite's basal plane is a well-established substrate for studying molecular adsorption and ordering.
    • Previous studies have explored various molecules on graphite, but detailed in situ observations of orientation-dependent registry are limited.

    Purpose of the Study:

    • To investigate the two-dimensional molecular organization of long-chain alkanes, alcohols, fatty acids, and dialkylbenzene on graphite.
    • To elucidate the relationship between molecular structure, orientation, and the resulting supramolecular lattice registry with the graphite substrate.
    • To observe dynamic molecular behavior, such as tilt angle switching, using high-speed imaging.

    Main Methods:

    Related Experiment Videos

    • Adsorption of long-chain molecules from organic solutions onto highly oriented pyrolytic graphite (HOPG).
    • In situ scanning tunneling microscopy (STM) for real-time imaging of molecular patterns at the nanoscale.
    • High-speed STM image acquisition to capture dynamic molecular rearrangements.

    Main Results:

    • Molecules self-assembled into lamellar structures with alkyl chains parallel to graphite lattice axes.
    • Observed two distinct orientations of the carbon skeleton planes relative to the substrate: perpendicular and parallel.
    • Alkanes and alcohols showed lamellar lattices in or near registry with graphite, while fatty acids and dialkylbenzenes did not.
    • Alcohols and dialkylbenzene exhibited domain boundaries due to molecular tilting (+30° or -30°).
    • Dynamic switching between tilt angles in alcohol monolayers was observed on millisecond timescales.

    Conclusions:

    • Molecular orientation significantly dictates the registry of self-assembled monolayers with the graphite substrate.
    • The observed registry differences are attributed to the orientation of the molecular carbon skeleton planes.
    • Dynamic molecular behavior, including reversible tilt switching, can occur in confined molecular systems.