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Shear force distance control at different relative humitities
A glass substrate (hydrophillic), partially covered with a Langmuir-Blodgett film of
arachidic acid (hydrophobic) was used to measure the influence of different relative
humidities on shear-force distance regulation, usually used in near-field optical
microscopy. At low relative humidities (left), the contaminating water layer is very thin
and height difference between glass substrate and LB-film is nearly as high as expected
from x-ray experiments. At higher humidities (right), the height difference decreases, due
to a growing water layer on the glass substrate. The height difference between both
pictures is 0,6 nm, corresponding to 2 layers of water molecules. (Sample courtesy of P.
Fromherz et al., MPI Martinsried)
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