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Sensors 2011, 11(2), 1526-1541; doi:10.3390/s110201526

Advances in SXFA-Coated SAW Chemical Sensors for Organophosphorous Compound Detection

1
Institute of Acoustics, Chinese Academy of Sciences, Beijing, 100190, China
2
Research Institute of Chemical Defense, Beijing, 102205, China
*
Author to whom correspondence should be addressed.
Received: 5 December 2010 / Revised: 20 January 2011 / Accepted: 22 January 2011 / Published: 27 January 2011
(This article belongs to the Section Chemical Sensors)
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Abstract

A polymer-coated surface acoustic wave (SAW)-based chemical sensor for organophosphorous compound sensing at extremely low concentrations was developed, in which a dual-delay-line oscillator coated with fluoroalcoholpolysiloxane (SXFA) acted as the sensor element. Response mechanism analysis was performed on the SXFA-coated chemical sensor, resulting in the optimal design parameters. The shear modulus of the SXFA, which is the key parameter for theoretical simulation, was extracted experimentally. New designs were done on the SAW devices to decrease the insertion loss. Referring to the new phase modulation approach, superior short-term frequency stability (±2 Hz in seconds) was achieved from the SAW oscillator using the fabricated 300 MHz delay line as the feedback element. In the sensor experiment on dimethylmethylphosphonate (DMMP) detection, the fabricated SXFA-coated chemical sensor exhibited an excellent threshold detection limit up to 0.004 mg/m3 (0.7 ppb) and good sensitivity (~485 Hz/mg/m3 for a DMMP concentration of 2~14 mg/m3). View Full-Text
Keywords: SAW chemical sensor; response mechanism; oscillator; threshold detection limit SAW chemical sensor; response mechanism; oscillator; threshold detection limit
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MDPI and ACS Style

Wang, W.; He, S.; Li, S.; Liu, M.; Pan, Y. Advances in SXFA-Coated SAW Chemical Sensors for Organophosphorous Compound Detection. Sensors 2011, 11, 1526-1541.

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