Ultrafast-response stabilized zirconia-based mixed potential type triethylamine sensor utilizing CoMoO4 sensing electrode

• Published in: Sensors and actuators. B, Chemical Chemical, 2018-11, Vol.272, p.433-440
• Main Authors: Liu, Fangmeng, Yang, Zijie, He, Junming, You, Rui, Wang, Jing, Li, Siqi, Lu, Huiying, Liang, Xishuang, Sun, Peng, Yan, Xu, Chuai, Xiaohong, Lu, Geyu
• Format: Article
• Language: English
• Subjects: CoMoO4; Mixed potential; Triethylamine sensor; YSZ
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2018.06.008

•A ultrafast-response YSZ-based mixed potential type gas sensor utilizing CoMoO4-SE was developed to effectively detect triethylamine.•The device attached with CoMoO4-SE sintered at 1000 °C exhibited the ultra-fast response rate (1 s) to 100 ppm TEA at 600 °C.•The fabricated sensor displayed the highest response value of −102 mV to 100 ppm TEA and the low detection limit of 100 ppb.•The sensor also showed good repeatability, selectivity, the excellent humidity resistance and long-term stability. An ultrafast-response yttria stabilized zirconia (YSZ)-based mixed potential type gas sensor utilizing molybdate CoMoO4 sensing electrode was developed to realize the effective detection of triethylamine (TEA) at 600 °C. The gas sensing characteristic of the fabricated sensor was optimized by changing the calcination temperature of CoMoO4 sensing material and results indicated that the device attached with CoMoO4-SE sintered at 1000 °C exhibited the highest response value (−102 mV) to 100 ppm TEA and low detection limit of 100 ppb at 600 °C. Interestingly, the response and recovery times of the present sensor to 100 ppm TEA were 1 s and 10 s, which signified the ultra-fast response rate. The response value of fabricated sensor displayed the piecewise linear function to logarithm of TEA concentrations and the sensitivities were −14 mV/decade (0.1–5 ppm) and −53 mV/decade (5–200 ppm), respectively. More importantly, the present sensor also exhibited good repeatability, selectivity, slight effect of humidity and long-term stability of 20 days, indicating a great candidate for use in detection of TEA. Furthermore, the device based on mixed potential mechanism was proposed and further verified using polarization curve.