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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.


Sensing characteristics of SE and RE for S-LSM95 sensors measured at 500 °C in the two-chamber mode.
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sensors-15-17558-f013: Sensing characteristics of SE and RE for S-LSM95 sensors measured at 500 °C in the two-chamber mode.

Mentions: In order to better understand the sensing mechanism of these NO2 sensors, Figure 13 compares the response voltages measured in the dual-chamber mode as illustrated in Figure 2, where the NO2 concentration varied from 40 to 1000 ppm. As expected, the response voltages in step 1 and 2 are almost zero during 10 min with both thick and thin LSM95 layers exposed to the base gas. With thick LSM95 layers exposed to the sample gas (Step 1), the increase in the response voltage with increasing NO2 concentrations is negligible. In a vivid contrast, increasing NO2 concentrations yield a pronounced increase in the response voltage for NO2 sensors with the thin LSM95 layers exposed to the sample gas (Step 2).


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)

Sensing characteristics of SE and RE for S-LSM95 sensors measured at 500 °C in the two-chamber mode.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17558-f013: Sensing characteristics of SE and RE for S-LSM95 sensors measured at 500 °C in the two-chamber mode.
Mentions: In order to better understand the sensing mechanism of these NO2 sensors, Figure 13 compares the response voltages measured in the dual-chamber mode as illustrated in Figure 2, where the NO2 concentration varied from 40 to 1000 ppm. As expected, the response voltages in step 1 and 2 are almost zero during 10 min with both thick and thin LSM95 layers exposed to the base gas. With thick LSM95 layers exposed to the sample gas (Step 1), the increase in the response voltage with increasing NO2 concentrations is negligible. In a vivid contrast, increasing NO2 concentrations yield a pronounced increase in the response voltage for NO2 sensors with the thin LSM95 layers exposed to the sample gas (Step 2).

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.