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Effect Of Viscoelasticity On Quality Factor Of Microcantilever Chemical Sensors: Optimal Coating Thickness For Minimum Limit Of Detection, F. Lochon, Isabelle Dufour, D. Rebière, U. Sampath, Stephen M. Heinrich, Fabien Josse
Effect Of Viscoelasticity On Quality Factor Of Microcantilever Chemical Sensors: Optimal Coating Thickness For Minimum Limit Of Detection, F. Lochon, Isabelle Dufour, D. Rebière, U. Sampath, Stephen M. Heinrich, Fabien Josse
Civil and Environmental Engineering Faculty Research and Publications
Microcantilevers with polymer coatings hold great promise as resonant chemical sensors. It is known that the coated cantilever sensitivity increases with coating thickness; however, the drawback of increasing the coating thickness is the increase of the frequency noise and thus the deterioration of the sensor's limit of detection. In this paper, an analytical expression for the viscoelastic losses in the coating, hence the quality factor is established and is used to explain the observed increase of the frequency noise with the polymer thickness. This result is then used to demonstrate that an optimum coating thickness exists that minimise the limit …
Study Of Viscoelastic Effect On The Frequency Shift Of Microcantilever Chemical Sensors (Proceedings), U. Sampath, Stephen M. Heinrich, Fabien Josse, F. Lochon, Isabelle Dufour, D. Rebière
Study Of Viscoelastic Effect On The Frequency Shift Of Microcantilever Chemical Sensors (Proceedings), U. Sampath, Stephen M. Heinrich, Fabien Josse, F. Lochon, Isabelle Dufour, D. Rebière
Civil and Environmental Engineering Faculty Research and Publications
Microcantilevers coated with a chemically sensitive layer are increasingly being used in chemical detection systems. The sensitive coating, often a polymer, absorbs specific molecules, which can be detected by monitoring the shift in the mechanical resonant frequency. Usually, the frequency shift resulting from molecular absorption is interpreted as a mass loading effect. However, mass loading is not the only effect that has an impact on the frequency shift; the viscoelastic properties of the sensitive coating are also affected by the sorption process. Sorption-induced modulus changes are typically difficult to characterize. However, it is known that the sorption of analyte molecules …