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Sensors 2013, 13(12), 16816-16828; doi:10.3390/s131216816
Article

Optimal Design of a Polyaniline-Coated Surface Acoustic Wave Based Humidity Sensor

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Received: 2 September 2013; Accepted: 14 November 2013 / Published: 5 December 2013
(This article belongs to the Special Issue Polymeric Micro Sensors and Actuators)
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Abstract: This paper presents an optimal design for a new humidity sensor composed of a dual-resonator oscillator configuration with an operation frequency of 300 MHz, and a polyaniline (PANI) coating deposited along the resonation cavity of the sensing device. To improve the corrosion resistance of the sensor chip, Al/Au electrodes were used to form the SAW resonator. Prior to device fabrication, the coupling of modes (COM) model was used for the performance prediction and optimal design parameters determination. Two SAW resonators with Al/Au electrodes were fabricated on an ST-X quartz substrate, and used as the frequency control element in the feedback path of an oscillator circuit. A PANI thin coating was deposited onto the resonator cavity of the sensing device by a spinning approach as the sensor material for relative humidity (RH) detection. High detection sensitivity, quick response, good repeatability and stability were observed from the sensor experiments at room temperature.
Keywords: Al/Au electrodes; COM model; humidity sensor; oscillator; polyaniline; resonator Al/Au electrodes; COM model; humidity sensor; oscillator; polyaniline; resonator
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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MDPI and ACS Style

Wang, W.; Xie, X.; He, S. Optimal Design of a Polyaniline-Coated Surface Acoustic Wave Based Humidity Sensor. Sensors 2013, 13, 16816-16828.

AMA Style

Wang W, Xie X, He S. Optimal Design of a Polyaniline-Coated Surface Acoustic Wave Based Humidity Sensor. Sensors. 2013; 13(12):16816-16828.

Chicago/Turabian Style

Wang, Wen; Xie, Xiao; He, Shitang. 2013. "Optimal Design of a Polyaniline-Coated Surface Acoustic Wave Based Humidity Sensor." Sensors 13, no. 12: 16816-16828.


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