CO2-sensing characteristics of SnO2 element modified by La2O3

Mizuno, Noritaka; Yoshioka, Tetsunori; Kato, K.; Iwamoto, Masakazu

doi:10.1016/0925-4005(93)85430-i

Cited by 59 publications

(26 citation statements)

References 8 publications

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“…Metal oxide-based resistive sensors have been previously investigated as CO 2 sensors and the related sensing mechanism has been studied [21][22][23][24][25]. On addition of CO 2 in the ambient surroundings the sensor, the following chemical reactions at low operating temperature have been proposed by Ostrick et al [33]:…”

Section: Sensing Mechanismmentioning

confidence: 99%

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CdO-based nanostructures as novel CO₂gas sensors

Krishnakumar¹,

Jayaprakash

Prakash

et al. 2011

Nanotechnology

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Crystalline Cd(OH) 2 /CdCO 3 nanowires, having lengths in the range from 0.3 up to several microns and 5-30 nm in diameter, were synthesized by a microwave-assisted wet chemical route and used as a precursor to obtain CdO nanostructures after a suitable thermal treatment in air. The morphology and microstructure of the as-synthesized and annealed materials have been investigated by scanning electron microscopy, transmission electron microscopy, x-ray diffraction and thermogravimetry-differential scanning calorimetry. The change in morphology and electrical properties with temperature has revealed a wire-to-rod transformation along with a decreases of electrical resistance.Annealed samples were printed on a ceramic substrate with interdigitated contacts to fabricate resistive solid state sensors. Gas sensing properties were explored by monitoring CO 2 in synthetic air in the concentration range 0.2-5 v/v% (2000-50 000 ppm). The effect of annealing temperature, working temperature and CO 2 concentration on sensing properties (sensitivity, response/recovery time and stability) were investigated. The results obtained demonstrate that CdO-based thick films have good potential as novel CO 2 sensors for practical applications.

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Section: Sensing Mechanismmentioning

confidence: 99%

“…The development of CO 2 sensors based on semiconductor gas sensor technology, enabling a reduction in both size and costs, has been widely pursued [21]. Metal oxide-based films compatible with solid state-based gas sensor technology, such as lanthanum doped tin oxide and BaTiO 3 /CuO, have been well investigated as CO 2 sensors [22,23].…”

Section: Introductionmentioning

confidence: 99%

CdO-based nanostructures as novel CO₂gas sensors

Krishnakumar¹,

Jayaprakash

Prakash

et al. 2011

Nanotechnology

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“…However, the sensitivity of these devices to concentrations of interest for indoor air quality (300ppm to 2000ppm) is too low. Other studies have reported promising metal oxide candidates such as La-doped SnO 2 and BiTiO 3 , which display reliable carbon dioxide sensing properties [7][8][9][10]. However, the carbon dioxide sensitivity was found to be significantly reduced in the presence of humidity.…”

Section: Introductionmentioning

confidence: 92%

Ba<inf>x</inf>WO<inf>y</inf> thick film as a carbon dioxide sensor

Cavanagh

Binions

2011

2011 IEEE SENSORS Proceedings

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Thick film metal oxide semiconductor gas sensors with a Ba x WO y active layer have been prepared and evaluated as carbon dioxide gas sensor devices. Ba x WO y was prepared by thermal methods and screen-printed as porous thick films gas sensors.The sensor material was characterized by scanning electron microscopy and X-ray diffraction. The sensors gas response was investigated by exposure to varying concentrations of CO 2 gas in synthetic air and mixtures of CO and CO 2 all at a variety of different operating temperatures.Finally the gas response was examined to potential intereferant gases including humidity. It was found that at an operating temperature of 450 °C and a 2500 ppm pulse of CO 2 the sensors gave a gas response of 5.8, higher than current literature values. It was also found that increasing relative humidity enhanced the gas response in contrast to other approaches.

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“…The gases' adsorption or their reaction on the surfaces of the semiconducting materials induces the change in the density of the conducting electrons in the polycrystalline sensor elements. Several oxides have been tested, and Ladoped SnO 2 and BaTiO 3 are reported to be the most reliable options for CO 2 detection [4][5][6]. However, comparison of the responses of SnO 2 -doped sensors reveals discrepancies in the resistance variation.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and Structural Investigations of Ag‐Added BaTiO₃‐CuO Mixed Oxide for CO₂ Gas Sensing

El-Sayed

Ismail

Yakout

2011

International Journal of Chemical Engineering

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Compositions having the general formula BaTiO 3 -CuO + x wt% Ag, where x = 0, 1, 1.5, and 2 have been prepared by solid state ceramic processing and sintered at 500 and 700• C for 5 h. Thermogravimetric analysis (TGA), X-ray powder diffraction (XRD), infrared absorption spectra (IR), and scanning electron microscopy (SEM) were used to characterize the obtained sensor pellets. It was found that no solid state reaction took place between BaTiO 3 and CuO during sintering process. The sensitivity of the prepared sensors to CO 2 gas increases with increasing sintering temperature and Ag content. The correlation between Ag content at different sintering temperature and structure characterization is discussed.

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CO2-sensing characteristics of SnO2 element modified by La2O3

Cited by 59 publications

References 8 publications

CdO-based nanostructures as novel CO₂gas sensors

CdO-based nanostructures as novel CO₂gas sensors

Ba<inf>x</inf>WO<inf>y</inf> thick film as a carbon dioxide sensor

Synthesis and Structural Investigations of Ag‐Added BaTiO₃‐CuO Mixed Oxide for CO₂ Gas Sensing

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CO2-sensing characteristics of SnO2 element modified by La2O3

Cited by 59 publications

References 8 publications

CdO-based nanostructures as novel CO2gas sensors

CdO-based nanostructures as novel CO2gas sensors

Ba<inf>x</inf>WO<inf>y</inf> thick film as a carbon dioxide sensor

Synthesis and Structural Investigations of Ag‐Added BaTiO3‐CuO Mixed Oxide for CO2 Gas Sensing

Contact Info

Product

Resources

About

CdO-based nanostructures as novel CO₂gas sensors

CdO-based nanostructures as novel CO₂gas sensors

Synthesis and Structural Investigations of Ag‐Added BaTiO₃‐CuO Mixed Oxide for CO₂ Gas Sensing