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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.


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Dependence of potential difference on porosity of thick LSM95 layers.
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sensors-15-17558-f009: Dependence of potential difference on porosity of thick LSM95 layers.

Mentions: The same thin LSM95 layers as SEs were co-fired with the four types of sensors with different amounts of carbon in the thick LSM95 REs (denoted as S-15LSM95, S-30LSM95, S-45LSM95 and S-60LSM95). Measurement were performed at 500 °C in various concentrations of NO2 (40–100 ppm). Figure 9 summarizes the ΔV at different RE porosities and NO2 concentrations, showing that the ΔV value decreased with increasing porosities. Therefore, low porosities of thick LSM95 as REs are preferred for better sensitivity of the new sensors. In particular, S-15LSM95 has the lowest porosity and exhibits the highest sensitivity.


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 potential difference on porosity of thick LSM95 layers.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17558-f009: Dependence of potential difference on porosity of thick LSM95 layers.
Mentions: The same thin LSM95 layers as SEs were co-fired with the four types of sensors with different amounts of carbon in the thick LSM95 REs (denoted as S-15LSM95, S-30LSM95, S-45LSM95 and S-60LSM95). Measurement were performed at 500 °C in various concentrations of NO2 (40–100 ppm). Figure 9 summarizes the ΔV at different RE porosities and NO2 concentrations, showing that the ΔV value decreased with increasing porosities. Therefore, low porosities of thick LSM95 as REs are preferred for better sensitivity of the new sensors. In particular, S-15LSM95 has the lowest porosity and exhibits the highest sensitivity.

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