Use of specific functionalised tips with STM: A new identification method of ester groups and their molecular structure in self-assembled overlayers

Cedric Volcke, Priscilla Simonis, François Durant, Paul Thiry, Philippe Lambin, Christine Culot, Christophe Humbert

    Research output: Contribution to journalArticle

    Abstract

    the influence of chemical modification of scanning tunneling microscopy tips on image contrast is studied. This technique is applied to the identification of an ester functional group, hardly visible otherwise. Self-assembled overlayers of wax esters (palmitoyl palmitate), adsorbed at the interface between highly oriented pyrolitic graphite and a solution of phenyloctane, are imaged. the gold tips used are chemically modified by 4-mercaptobenzoic acid and 4-mercaptotoluene. the stability of the ordered overlayers formed facilitates the reproducible set of images with submolecular resolution. This allows the identification of the layer regular structure and of other features which can be unamiguously related to the fingerprints of the COO bond. Moreover, we are interested in finding evidence of molecular motions observed at domain boundaries.
    Original languageEnglish
    Pages (from-to)4185-4190
    Number of pages6
    JournalChemistry: A European Journal
    Volume11
    Issue number14
    Publication statusPublished - 2005

    Keywords

    • Interfaces -Scanning Probe Microscopy - Self-assembly

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