Journal
APPLIED PHYSICS LETTERS
Volume 80, Issue 12, Pages 2219-2221Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1463720
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Although resonating microcantilevers are demonstrated to be excellent mass sensors, adsorption-induced changes in the spring constant result in errors in the calculation of adsorbed mass from shifts in resonance frequencies. However, simultaneous measurement of resonance frequency and adsorption-induced cantilever bending can be used to determine the variation in spring constant. Plotting the change in surface stress as a function of analyte concentration, the surface excess of adsorbed molecules and, therefore, the mass adsorbed can be determined. Here, we demonstrate this concept for adsorption of Na+ ions on microcantilevers in NaCl solutions where a change in the spring constant was found to increase from 9.5x10(-4) to 7.5x10(-3) N/m as the NaCl concentration increased from 0.05 to 0.8 M. (C) 2002 American Institute of Physics.
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