Title

Effect of Viscoelasticity on Quality Factor of Microcantilever Chemical Sensors: Optimal Coating Thickness for Minimum Limit of Detection

Document Type

Conference Proceeding

Language

eng

Publication Date

10-2005

Publisher

Institute of Electrical and Electronics Engineers (IEEE)

Source Publication

2005 IEEE Sensors Proceedings

Source ISSN

0-7803-9056-3

Original Item ID

doi: 10.1109/ICSENS.2005.1597687

Abstract

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

Comments

Published as part of the proceedings of the conference, 2005 IEEE Sensors, 2005. DOI.