Buried Silver Nanowires Revealed Through PiFM Imaging

 PiFM imaging reveals buried silver nanowires in transparent and conductive thin film:

PiFM Imaging of Silver Nanowires in Thin Film
PiFM imaging reveals silver nanowires in transparent and conductive thin film, unseen by AFM topography and phase images.

Silver nanowires underneath the protective layer are not visible in AFM topography and phase images. However, they are easily visible in the PiFM images. The PiFM image at 1730 1/cm of the protective layer shows less signal for the tall structures in the topography. This suggests that it is foreign material on top of the protective layer. However, the buried silver nanowires show up in PiFM images at all wavenumbers since the near-field from the tip is coupled effectively to the conductive nanowire, creating a strong attractive force even through a rather thick protective layer (>100 nm).

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