Effect of adsorption-induced surface stress change on the stiffness of a microcantilever used as a salinity detection sensor

Kim, S.; Kihm, K. D.
August 2008
Applied Physics Letters;8/25/2008, Vol. 93 Issue 8, p081911
Academic Journal
A microcantilever surface stress-stiffness relationship has been investigated for three decades. Most of the surface stress induced stiffness change models, however, are limited to apply for vacuum environment, and they did not account for the hydrodynamic loading term that is essential for a microcantilever in a liquid medium. In this letter, we present both analytical and experimental examinations of the effect of adsorption-induced surface stress changes on microcantilever stiffness in a saline solution. It is found that the surface adsorption of sodium ions increases the stiffness of a microcantilever.


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