Electronic Resource
Woodbury, NY
:
American Institute of Physics (AIP)
Applied Physics Letters
80 (2002), S. 2219-2221
ISSN:
1077-3118
Source:
AIP Digital Archive
Topics:
Physics
Notes:
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 9.5×10−4 to 7.5×10−3 N/m as the NaCl concentration increased from 0.05 to 0.8 M. © 2002 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.1463720
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