Journal
PHYSICAL REVIEW B
Volume 72, Issue 8, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.72.085405
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The effect of surface stress on the resonance frequency of a cantilever sensor is modeled analytically by incorporating strain-dependent surface stress terms into the equations of motion. This mechanistic approach can be equated with a corresponding thermodynamic description, allowing basic equations to be derived that link the analysis to experimentally determined parameters. Examples are shown for the cases of a pure surface stress and an adsorption-induced surface stress, and indicate that frequency measurements may be useful for fundamental understanding of surface and adsorption-induced stresses on metals, semiconductors, and nanoscale structures. Application to biomolecular adsorption sensors appears unlikely.
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