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Vol. 149, No. 2, February 2013, pp. 76-82




Embedded Piezoresistive Microcantilever Sensors Functionalized for the Detection of Methyl Salicylate

1 Timothy L. Porter, 2 Richard J. Venedam

1 College of Sciences, University of Nevada Las Vegas, Las Vegas, NV, 89154 USA

Tel.: +1 (702) 895 2058

2 National Security Technologies LLC, Las Vegas, Nevada, 89183, USA

Tel.: +1 (702) 630 0192

E-mail: tim.porter@unlv.edu, venedarj@nv.doe.gov


Received: 14 January 2013   /Accepted: 14 February 2013   /Published: 28 February 2013

Digital Sensors and Sensor Sysstems


Abstract: Sensors designed to detect the presence of methyl salicylate (MeS) have been tested. These sensors use a sensor platform based on the embedded piezoresistive microcantilever (EPM) design. Sensing materials tested in this study included the polymer poly (ethylene vinyl acetate), or PEVA as well as a composite sensing material consisting of the enzyme SA-binding protein 2, or SABP-2. The SABP-2 was immobilized within a biocompatible Hypol gel matrix. The PEVA-based sensors exhibited slower but reversible responses to MeS vapors, recovering fully to their initial state after the analyte was removed. SABP-2 sensors exhibited faster overall response to the introduction of MeS, responding nearly instantly. These sensors, however, do not recover after exposures have ended. Sensors using the SABP-2 sensing materials act instead as integrating sensors, measuring irreversibly the total MeS dose obtained.


Keywords: Microcantilever, Methyl salicylate, Piezoresistive, SABP-2, Biosensor


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