Effect of Viscoelasticity on Quality Factor of Microcantilever Chemical Sensors: Optimal Coating Thickness for Minimum Limit of Detection
Institute of Electrical and Electronics Engineers (IEEE)
2005 IEEE Sensors Proceedings
Original Item ID
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 of detection
Lochon, F.; Dufour, Isabelle; Rebière, D.; Sampath, U.; Heinrich, Stephen M.; and Josse, Fabien, "Effect of Viscoelasticity on Quality Factor of Microcantilever Chemical Sensors: Optimal Coating Thickness for Minimum Limit of Detection" (2005). Civil and Environmental Engineering Faculty Research and Publications. 61.