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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.
CitationChiesa, M. [et al.]. Investigation of nanoscale interactions by means of subharmonic excitation. "Journal of Physical Chemistry Letters", 16 Agost 2012, vol. 3, núm. 16, p. 2125-2129.
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