Document Type

Article

Language

eng

Format of Original

8 p.

Publication Date

8-2008

Publisher

American Chemical Society

Source Publication

Analytical Chemistry

Source ISSN

0003-2700

Original Item ID

doi: 10.1021/ac800269x

Abstract

Expressions describing the resonant frequency and quality factor of a dynamically driven, polymer-coated microcantilever in a viscous liquid medium have been obtained. These generalized formulas are used to describe the effects the operational medium and the viscoelastic coating have on the device sensitivity when used in liquid-phase chemical sensing applications. Shifts in the resonant frequency are normally assumed proportional to the mass of sorbed analyte in the sensing layer. However, the expression for the frequency shift derived in this work indicates that the frequency shift is also dependent on changes in the sensing layer’s loss and storage moduli, changes in the moment of inertia, and changes in the medium of operation’s viscosity and density. Not accounting for these factors will lead to incorrect analyte concentration predictions. The derived expressions are shown to reduce to well-known formulas found in the literature for the case of an uncoated cantilever in a viscous liquid medium and the case of a coated cantilever in air or in a vacuum. The theoretical results presented are then compared to available chemical sensor data in aqueous and viscous solutions.

Comments

Accepted version. Analytical Chemistry, Vol. 80, No. 15 (August 2008): 5760-5767. DOI. © 2008 American Chemical Society. Used with permission.

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