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)


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
Issue number16
Publication statusPublished - 16 Aug 2012


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