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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.


Related in: MedlinePlus

Dependence of response voltages on logarithm NO2 concentrations in the sample gas at 500–600 °C for the sensors: (a) S-LSM95 and (b) S-Pt.
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sensors-15-17558-f011: Dependence of response voltages on logarithm NO2 concentrations in the sample gas at 500–600 °C for the sensors: (a) S-LSM95 and (b) S-Pt.

Mentions: Figure 11 summarizes the sensing characteristics of two sensors toward various NO2 concentrations from 40 to 1000 ppm in the sample gas at 500, 550 and 600 °C. It is seen that the measured voltage strongly depends on the SE material. The largest voltage values are 77 mV for S-15LSM95 and 48 mV for S-15Pt, both of which were obtained at 500 °C with the NO2 concentration is 1000 ppm in the sample gas. Comparison of the fitting results in Figure 6a,b indicates that S-LSM95 exhibited higher sensitivity, as evidenced by larger slopes, and much better linearity between the sensitivity and the logarithm of NO2 concentration. In particular, the highest linearity is 0.99 by fitting the results of S-15LSM95 at 500 °C with the largest sensitivity of 52 mV/decade.


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)

Dependence of response voltages on logarithm NO2 concentrations in the sample gas at 500–600 °C for the sensors: (a) S-LSM95 and (b) S-Pt.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17558-f011: Dependence of response voltages on logarithm NO2 concentrations in the sample gas at 500–600 °C for the sensors: (a) S-LSM95 and (b) S-Pt.
Mentions: Figure 11 summarizes the sensing characteristics of two sensors toward various NO2 concentrations from 40 to 1000 ppm in the sample gas at 500, 550 and 600 °C. It is seen that the measured voltage strongly depends on the SE material. The largest voltage values are 77 mV for S-15LSM95 and 48 mV for S-15Pt, both of which were obtained at 500 °C with the NO2 concentration is 1000 ppm in the sample gas. Comparison of the fitting results in Figure 6a,b indicates that S-LSM95 exhibited higher sensitivity, as evidenced by larger slopes, and much better linearity between the sensitivity and the logarithm of NO2 concentration. In particular, the highest linearity is 0.99 by fitting the results of S-15LSM95 at 500 °C with the largest sensitivity of 52 mV/decade.

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.


Related in: MedlinePlus