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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.


Schematic illustration of NO2 sensors measured in the two-chamber mode.
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sensors-15-17558-f002: Schematic illustration of NO2 sensors measured in the two-chamber mode.

Mentions: In order to individually evaluate the sensing performances of thick and thin LSM95 layers toward NO2, S-15LSM95 was also measured in a two-chamber mode. The measurement was first performed with thin LSM95 layers exposed to the base gas while the thick LSM95 layers switched between the sample gas and the base gas, as shown in Figure 2a. In the second step, the environments were reversed with the thick LSM95 layer exposed to the base gas and the thin LSM95 layer to either the sample or base gas (Figure 2b). Note that the lag time between the sample gas and the base gas was always held for 10 min. The total gas flow rate was maintained at 200 cm3/min. The voltage responses were recorded by using a multifunction data acquisition card (HP 34970A, Santa Clara, CA, USA).


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)

Schematic illustration of NO2 sensors measured in the two-chamber mode.
© Copyright Policy
Related In: Results  -  Collection

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

sensors-15-17558-f002: Schematic illustration of NO2 sensors measured in the two-chamber mode.
Mentions: In order to individually evaluate the sensing performances of thick and thin LSM95 layers toward NO2, S-15LSM95 was also measured in a two-chamber mode. The measurement was first performed with thin LSM95 layers exposed to the base gas while the thick LSM95 layers switched between the sample gas and the base gas, as shown in Figure 2a. In the second step, the environments were reversed with the thick LSM95 layer exposed to the base gas and the thin LSM95 layer to either the sample or base gas (Figure 2b). Note that the lag time between the sample gas and the base gas was always held for 10 min. The total gas flow rate was maintained at 200 cm3/min. The voltage responses were recorded by using a multifunction data acquisition card (HP 34970A, Santa Clara, CA, USA).

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.