Investigation of nanoscale interactions by means of subharmonic excitation

Matteo Chiesa, Karim Gadelrab, Marco Stefancich, Peter Armstrong, Guang Li, Tewfik Souier, Neil H. Thomson, Victor Barcons, Josep Font, Albert Verdaguer, Michael A. Phillips, Sergio Santos

    Research output: Contribution to journalArticleResearchpeer-review

    10 Citations (Scopus)

    Abstract

    Multifrequency atomic force microscopy holds promise as a method to provide qualitative and quantitative information about samples with high spatial resolution. Here, we provide experimental evidence of the excitation of subharmonics in ambient conditions in the regions where capillary interactions are predicted to be the mechanism of excitation. We also experimentally decouple a second mechanism for subharmonic excitation that is highly independent of environmental conditions such as relative humidity. This implies that material properties could be mapped. Subharmonic excitation could lead to experimental determination of surface water affinity in the nanoscale whenever water interactions are the mechanism of excitation. © 2012 American Chemical Society.
    Original languageEnglish
    Pages (from-to)2125-2129
    JournalJournal of Physical Chemistry Letters
    Volume3
    Issue number16
    DOIs
    Publication statusPublished - 16 Aug 2012

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