Double-microcantilever design for surface stress measurement in biochemical sensors

T. I. Yin, Shih-Ming Yang

Research output: Contribution to conferencePaperpeer-review

Abstract

Microcantilever biochemical sensor with embedded piezoresistor has been proposed to measure the surface stress change from biochemical reaction. However, the sensor performance is adversely influenced by the self-heating of piezoresistor and biaxial surface stress loading. A mechanics model of piezoresistive microcantilever subject to surface stress loading is developed in this paper. A double-microcantilever design composed of the top immobilized microcantilever and the bottom sensing microcantilever is also proposed such that the surface stress loading can be converted to a concentrated force loading. The effect of biaxial surface stress can thus be limited to the immobilized microcantilever with the nniaxial strain in the sensing microcantilever. Analyses show that the surface stress sensitivity can be increased by high length ratio and lower thickness ratio of the two cantilevers. More than two orders of magnitude in measurement sensitivity can be achieved and the induced thermal effect in microcantilever can be minimized.

Original languageEnglish
Pages201-206
Number of pages6
Publication statusPublished - 2005 Nov 16
EventProceedings of the 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM 2005 - Monterey, CA, United States
Duration: 2005 Jul 242005 Jul 28

Other

OtherProceedings of the 2005 IEEE/ASME International Conference on Advanced Intelligent Mechatronics, AIM 2005
CountryUnited States
CityMonterey, CA
Period05-07-2405-07-28

All Science Journal Classification (ASJC) codes

  • Control and Systems Engineering
  • Software
  • Computer Science Applications
  • Electrical and Electronic Engineering

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