Atomic-scale roughness effect on capillary force in atomic force microscopy |
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Authors: | Jang Joonkyung Ratner M A Schatz George C |
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Institution: | School of Nano Science & Technology, Pusan National University, Busan 609-735, South Korea. jkjang@pusan.ac.kr |
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Abstract: | We study the capillary force in atomic force microscopy by using Monte Carlo simulations. Adopting a lattice gas model for water, we simulated water menisci that form between a rough silicon-nitride tip and a mica surface. Unlike its macroscopic counterpart, the water meniscus at the nanoscale gives rise to a capillary force that responds sensitively to the tip roughness. With only a slight change in tip shape, the pull-off force significantly changes its qualitative variation with humidity. |
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