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Sensors 2015, 15(7), 17558-17571; doi:10.3390/s150717558

Potentiometric NO2 Sensors Based on Thin Stabilized Zirconia Electrolytes and Asymmetric (La0.8Sr0.2)0.95MnO3 Electrodes

1
Gas Sensors & Sensing Technology Laboratory, College of Information Science and Engineering, Ningbo University, Ningbo 315211, China
2
CAS Key Laboratory of Materials for Energy Conversion, Shanghai Institute of Ceramics, Chinese Academy of Sciences (SICCAS), Shanghai 200050, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Michael Tiemann
Received: 4 June 2015 / Revised: 1 July 2015 / Accepted: 6 July 2015 / Published: 20 July 2015
(This article belongs to the Special Issue Gas Sensors—Designs and Applications)
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Abstract

Here we report on a new architecture for potentiometric NO2 sensors that features thin 8YSZ electrolytes sandwiched between two porous (La0.8Sr0.2)0.95MnO3 (LSM95) layers—one thick and the other thin—fabricated by the tape casting and co-firing techniques. Measurements of their sensing characteristics show that reducing the porosity of the supporting LSM95 reference electrodes can increase the response voltages. In the meanwhile, thin LSM95 layers perform better than Pt as the sensing electrode since the former can provide higher response voltages and better linear relationship between the sensitivities and the NO2 concentrations over 40–1000 ppm. The best linear coefficient can be as high as 0.99 with a sensitivity value of 52 mV/decade as obtained at 500 °C. Analysis of the sensing mechanism suggests that the gas phase reactions within the porous LSM95 layers are critically important in determining the response voltages. View Full-Text
Keywords: NO2; sensors; lanthanum strontium manganite; yttria-stabilized zirconia; gas-phase reaction NO2; sensors; lanthanum strontium manganite; yttria-stabilized zirconia; gas-phase reaction
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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. (CC BY 4.0).

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Zou, J.; Zheng, Y.; Li, J.; Zhan, Z.; Jian, J. Potentiometric NO2 Sensors Based on Thin Stabilized Zirconia Electrolytes and Asymmetric (La0.8Sr0.2)0.95MnO3 Electrodes. Sensors 2015, 15, 17558-17571.

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