Enhanced Sensitivity of a Love Wave-Based Methane Gas Sensor Incorporating a Cryptophane-A Thin Film
1
Institute of Acoustics, Chinese Academy of Sciences, Beijing 100190, China
2
University of Chinese Academy of Sciences, Beijing 100190, China
3
State Key Laboratory of NBC Protection for Civilian, Yangfang, Changping District, Beijing 102205, China
4
School of Chemistry and Chemical Engineering, Shanxi University, Taiyuan 030006, China
*
Authors to whom correspondence should be addressed.
Sensors 2018, 18(10), 3247; https://doi.org/10.3390/s18103247
Received: 4 September 2018
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Revised: 25 September 2018
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Accepted: 25 September 2018
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Published: 27 September 2018
(This article belongs to the Special Issue Surface Acoustic Wave Sensors)
A Love wave-based sensing chip incorporating a supramolecular cryptophane A (CrypA) thin film was proposed for methane gas sensing in this work. The waveguide effect in the structure of SiO2/36° YX LiTaO3 will confine the acoustic wave energy in SiO2 thin-film, which contributes well to improvement of the mass loading sensitivity. The CrypA synthesized from vanillyl alcohol by a double trimerisation method was dropped onto the wave propagation path of the sensing device, and the adsorption to methane gas molecules by supramolecular interactions in CrypA modulates the acoustic wave propagation, and the corresponding frequency shifts were connected as the sensing signal. A theoretical analysis was performed to extract the coupling of modes for sensing devices simulation. Also, the temperature self-compensation of the Love wave devices was also achieved by using reverse polarity of the temperature coefficient in each media in the waveguide structure. The developed CrypA coated Love wave sensing device was connected into the differential oscillation loop, and the corresponding gas sensitive characterization was investigated. High sensitivity, fast response, and excellent temperature stability were successfully achieved.
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Keywords:
cryptophane A; differential oscillation; Love wave methane gas sensor; waveguide effect; self-temperature compensation
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MDPI and ACS Style
Wang, W.; Fan, S.; Liang, Y.; He, S.; Pan, Y.; Zhang, C.; Dong, C. Enhanced Sensitivity of a Love Wave-Based Methane Gas Sensor Incorporating a Cryptophane-A Thin Film. Sensors 2018, 18, 3247. https://doi.org/10.3390/s18103247
AMA Style
Wang W, Fan S, Liang Y, He S, Pan Y, Zhang C, Dong C. Enhanced Sensitivity of a Love Wave-Based Methane Gas Sensor Incorporating a Cryptophane-A Thin Film. Sensors. 2018; 18(10):3247. https://doi.org/10.3390/s18103247
Chicago/Turabian StyleWang, Wen, Shuyao Fan, Yong Liang, Shitang He, Yong Pan, Caihong Zhang, and Chuan Dong. 2018. "Enhanced Sensitivity of a Love Wave-Based Methane Gas Sensor Incorporating a Cryptophane-A Thin Film" Sensors 18, no. 10: 3247. https://doi.org/10.3390/s18103247
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