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A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

A Novel Surface Acoustic Wave Sensor Array Based on Wireless Communication Network

Yong Pan, Ning Mu, Bo Liu, Bingqing Cao, Wen Wang, Liu Yang

Sensors (Basel). 2018 Sep 6;18(9):2977.

PMID: 30200649

Abstract:

A novel surface acoustic wave (SAW) sensor array based on wireless communication network is prepared. The array is composed of four SAW sensors, a wireless communication network module, and a global positioning system (GPS) module. The four SAW sensors of the array are coated with triethanolamine, polyepichlorohydrin, fluoroalcoholpolysiloxane, and L-glutamic acid hydrochloride to detect hydrogen sulfide (H₂S), 2-chloroethyl ethyl sulfide (CEES), dimethylmethylphosphonate (DMMP), and ammonia (NH₃) at film thicknesses of 50⁻100 nm. The wireless communication network module consists of an acquisition unit, a wireless control unit, and a microcontroller unit. By means of Zigbee and Lora technologies, the module receives and transmits the collected data to a PC work station in real-time; moreover, the module can control the sensor array's working mode and monitor the working status. Simultaneously, the testing location is determined by the GPS module integrated into the SAW sensor array. H₂S, CEES, DMMP, and NH₃ are detected in 300 m at different concentrations. Given the practical future application in environment in the future, the low, safe concentrations of 1.08, 0.59, 0.10, and 5.02 ppm for H₂S, CEES, DMMP, and NH₃, respectively, are detected at the lowest concentration, and the sensitivities of different sensors of the sensor array are 32.4, 14.9, 78.1 and 22.6 Hz/ppm, respectively. With the obtained fingerprints and pattern recognition technology, the detected gases can be recognized.

Chemicals Related in the Paper:

Catalog Number	Product Name	Structure	CAS Number	Price
AP138158	L-Glutamic acid hydrochloride		138-15-8	Price
AP24969060	Polyepichlorohydrin		24969-06-0	Price

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