Abstract
Scanning force and friction microscopy (SFFM) permitted us to measure the surface of highly oriented pyrolytic graphite (HOPG) in electrolytic environment and under potential control. With the experimental setup described we monitored topography and friction at steps on the HOPG surface in various electrolytes. The behavior of friction at steps indicates that the contrast is due to a change in interaction between tip and sample and no artifact of scanning.
A characteristic enhancement of friction at the steps with respect to the HOPG plane was visible both on upward and on downward steps. While cycling the potential a significant change in friction on step edges on the surface could be observed. No topographic changes or changes of the tip shape were visible during potential sweep, thus indicating a true ‘chemical sensitivity’ of the instrument. We did observe a dependence on the ionic composition of the electrolyte but not on the ionic concentration.
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© 1995 Springer Science+Business Media Dordrecht
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Weilandt, E., Menck, A., Binggeli, M., Marti, O. (1995). Friction Force Measurements on Graphite Steps under Potential Control. In: Gewirth, A.A., Siegenthaler, H. (eds) Nanoscale Probes of the Solid/Liquid Interface. NATO ASI Series, vol 288. Springer, Dordrecht. https://doi.org/10.1007/978-94-015-8435-7_17
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DOI: https://doi.org/10.1007/978-94-015-8435-7_17
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