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Capacitive micromachined ultrasonic transducer (CMUT) as a chemical sensor for DMMP detection

Title
Capacitive micromachined ultrasonic transducer (CMUT) as a chemical sensor for DMMP detection
Author
박관규
Keywords
Capacitive micromachined ultrasonic transducer; CMUT; MEMS resonator; Chemical sensor
Issue Date
2011-12
Publisher
Elsevier Science B.V., Amsterdam.
Citation
Sensors & Actuators: B. Chemical 2011, 160(1), p.1120-1127
Abstract
We present a chemical sensor based on a capacitive micromachined ultrasonic transducer (CMUT) configured as a resonant mass sensor with a chemically selective polymer coating. The sensing unit of the CMUT consists of 100s to 1000s of resonators connected in parallel and acts as a single resonator. The high resonant frequency (18.2MHz) and the small mass (296pg) enable the CMUT to have a good mass sensitivity of 130zg/Hz/μm2. We functionalized the CMUT with polyisobutylene (PIB) as the sorbent film, which targets dimethyl methylphosphonate (DMMP), a simulant for nerve agent, sarin. An oscillator circuit was populated to trace the resonant frequency of the CMUT with a fast response time and low noise. We characterized the noise performance of the sensor system and identified the optimal gate time of the read-out frequency counter. Based on the noise measurement, the calculated limit of detection (LOD) of mass loading is 0.192ag/μm2 (3-σ confidence level). Chemical experiments were performed on the CMUT sensor with several analytes including DMMP, water, and ethanol. The limit of detection of the CMUT chemical sensor to DMMP vapor was measured as 56ppb (3-σ confidence level).
URI
https://www.sciencedirect.com/science/article/pii/S0925400511008380http://hdl.handle.net/20.500.11754/65866
ISSN
0925-4005
DOI
10.1016/j.snb.2011.09.036
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > MECHANICAL ENGINEERING(기계공학부) > Articles
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