Journal article
Hydrogel-based microsensors for wireless chemical monitoring
Biomedical microdevices, Vol.11(3), pp.529-538
06/2009
DOI: 10.1007/s10544-008-9168-5
PMID: 18335316
Abstract
We report fabrication and characterization of a new hydrogel-based microsensor for wireless chemical monitoring. The basic device structure is a high-sensitivity capacitive pressure sensor coupled to a stimuli-sensitive hydrogel that is confined between a stiff porous membrane and a thin glass diaphragm. As small molecules pass through the porous membrane, the hydrogel swells and deflects the diaphragm which is also the movable plate of the variable capacitor in an LC resonator. The resulting change in resonant frequency can be remotely detected by the phase-dip technique. Prior to hydrogel loading, the sensitivity of the pressure sensor to applied air pressure was measured to be 222kHz/kPa over the range of 41.9–51.1MHz. With a pH-sensitive hydrogel, the sensor displayed a sensitivity of 1.16MHz/pH for pH3.0–6.5, and a response time of 45 minutes.
Details
- Title: Subtitle
- Hydrogel-based microsensors for wireless chemical monitoring
- Creators
- Ming Lei - Intel Corp Chandler AZ USAAntonio Baldi - Centro Nacional de Microelectronica (CNM-IMB, CSIC) Barcelona SpainEric Nuxoll - Department of Pharmaceutics University of Minnesota Minneapolis MN 55455 USARonald Siegel - Department of Biomedical Engineering University of Minnesota Minneapolis MN 55455 USABabak Ziaie - School of Electrical and Computer Engineering, Birck Nanotechnology Center Purdue University West Lafayette IN 47907 USA
- Resource Type
- Journal article
- Publication Details
- Biomedical microdevices, Vol.11(3), pp.529-538
- Publisher
- Springer US; Boston
- DOI
- 10.1007/s10544-008-9168-5
- PMID
- 18335316
- ISSN
- 1387-2176
- eISSN
- 1572-8781
- Language
- English
- Date published
- 06/2009
- Academic Unit
- Pharmaceutical Sciences and Experimental Therapeutics; Chemical and Biochemical Engineering
- Record Identifier
- 9984003468602771
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