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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

Cross-sensitivities of S-LSM95 and S-Pt to various gases (400 ppm) at 500 °C in the sample gas.
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sensors-15-17558-f012: Cross-sensitivities of S-LSM95 and S-Pt to various gases (400 ppm) at 500 °C in the sample gas.

Mentions: Note that various gases, other than NO2, including H2, C3H6, CH4, NH3, CO and NO exist in the car exhaust. Figure 12 compares the cross-sensitivities of the two sensors toward these gases at 400 ppm in sample gas, as measured at 500 °C. Both sensors exhibited the highest sensitivity to NO2. In contrast, the responses to most of the other gases are negligibly small (<6 mV) except for the values of 16–18 mV measured for S-Pt toward CO and S-15LSM95 toward NO, which are approximately half the value for the former and one third for the latter in NO2. Therefore, it can be concluded that S-15LSM95 exhibits better sensing characteristics than S-Pt at 500 °C.


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)

Cross-sensitivities of S-LSM95 and S-Pt to various gases (400 ppm) at 500 °C in the sample gas.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17558-f012: Cross-sensitivities of S-LSM95 and S-Pt to various gases (400 ppm) at 500 °C in the sample gas.
Mentions: Note that various gases, other than NO2, including H2, C3H6, CH4, NH3, CO and NO exist in the car exhaust. Figure 12 compares the cross-sensitivities of the two sensors toward these gases at 400 ppm in sample gas, as measured at 500 °C. Both sensors exhibited the highest sensitivity to NO2. In contrast, the responses to most of the other gases are negligibly small (<6 mV) except for the values of 16–18 mV measured for S-Pt toward CO and S-15LSM95 toward NO, which are approximately half the value for the former and one third for the latter in NO2. Therefore, it can be concluded that S-15LSM95 exhibits better sensing characteristics than S-Pt at 500 °C.

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