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Proceedings Paper

Enhancing the sensitivity of microcantilever-based sensors via geometry modification
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Paper Abstract

Microcantilever based sensors have been being widely used for measuring or detecting various physical conditions, chemical agents and biological species. Researchers are continuing to focus on enhancing the sensitivity of these devices toward improving their performance and applicability. In this paper, a numerical study is performed to assess the influence of microcantilever geometry on sensitivity to improve these devices for better detection of hazardous biological agents in liquid environments. Modal analyses were performed on microcantilevers of different geometries and shapes using ANSYS software and compared to the basic rectangular shaped microcantilever structures employed by most researchers. These structures all possessed a 50 μm length, 0.5 μm thickness and 25 μm width where the cantilever is clamped to the substrate, and were analyzed for their basic resonance frequency as well as the frequency shift for the attachment of a 0.285 picogram of mass attached on their surfaces. These numerical results are compared for the improvement of the sensitivity for MEMS based microcantilever sensor, which is particularly promising for biosensor applications. Of the geometries studied a few were found to possess a significant increase in mass sensitivity over regular rectangular shaped cantilever beam structures of similar dimensions. In particular, it was found that geometries possessing larger clamping widths and/or reduced effective mass at the free end yielded enhanced sensitivity. A triangular shape was found to increase mass sensitivity an order of magnitude over standard rectangular shapes.

Paper Details

Date Published: 18 May 2006
PDF: 9 pages
Proc. SPIE 6223, Micro (MEMS) and Nanotechnologies for Space Applications, 62230S (18 May 2006); doi: 10.1117/12.663682
Show Author Affiliations
Shakib Morshed, Auburn Univ. (United States)
Barton C. Prorok, Auburn Univ. (United States)

Published in SPIE Proceedings Vol. 6223:
Micro (MEMS) and Nanotechnologies for Space Applications
Thomas George; Zhong-Yang Cheng, Editor(s)

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