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

Zou J, Zheng Y, Li J, Zhan Z, Jian J - Sensors (Basel) (2015)

Bottom Line: Measurements of their sensing characteristics show that reducing the porosity of the supporting LSM95 reference electrodes can increase the response voltages.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 Article: PubMed Central - PubMed

Affiliation: Gas Sensors & Sensing Technology Laboratory, College of Information Science and Engineering, Ningbo University, Ningbo 315211, China. ljl2005@mail.sic.ac.cn.

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.

No MeSH data available.


SEM micrographs of thick LSM95 layers, (a) 15 wt % carbon; (b) 30 wt % carbon; (c) 45 wt % carbon; (d) 60 wt % carbon.
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sensors-15-17558-f006: SEM micrographs of thick LSM95 layers, (a) 15 wt % carbon; (b) 30 wt % carbon; (c) 45 wt % carbon; (d) 60 wt % carbon.

Mentions: Figure 6a–d show the microstructure of thick LSM95 layers with different amounts of pore former (15, 30, 45 and 60 wt %). Both the pore size and porosity increased gradually with increasing of pore formers, as confirmed by the mercury porosimetry measurements shown in Figure 7. In particular, the mean pore sizes are 430, 680, 820 and 1000 nm and the porosities are 20.9%, 41.9%, 50.1% and 65.2% for LSM95 substrates with 15, 30, 45 and 60 wt % carbon, respectively.


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

Zou J, Zheng Y, Li J, Zhan Z, Jian J - Sensors (Basel) (2015)

SEM micrographs of thick LSM95 layers, (a) 15 wt % carbon; (b) 30 wt % carbon; (c) 45 wt % carbon; (d) 60 wt % carbon.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4541949&req=5

sensors-15-17558-f006: SEM micrographs of thick LSM95 layers, (a) 15 wt % carbon; (b) 30 wt % carbon; (c) 45 wt % carbon; (d) 60 wt % carbon.
Mentions: Figure 6a–d show the microstructure of thick LSM95 layers with different amounts of pore former (15, 30, 45 and 60 wt %). Both the pore size and porosity increased gradually with increasing of pore formers, as confirmed by the mercury porosimetry measurements shown in Figure 7. In particular, the mean pore sizes are 430, 680, 820 and 1000 nm and the porosities are 20.9%, 41.9%, 50.1% and 65.2% for LSM95 substrates with 15, 30, 45 and 60 wt % carbon, respectively.

Bottom Line: Measurements of their sensing characteristics show that reducing the porosity of the supporting LSM95 reference electrodes can increase the response voltages.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 Article: PubMed Central - PubMed

Affiliation: Gas Sensors & Sensing Technology Laboratory, College of Information Science and Engineering, Ningbo University, Ningbo 315211, China. ljl2005@mail.sic.ac.cn.

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.

No MeSH data available.