On the role of catalytic additives in gas-sensitivity of SnO2-Mo based thin film sensors

Ivanovskaya, M. I.; Bogdanov, P; Faglia, G.; Nelli, P.; Sberveglieri, G.; Taroni, A.

doi:10.1016/s0925-4005(01)00709-2

Cited by 50 publications

(28 citation statements)

References 8 publications

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“…As demonstrated recently, 3,20 films of Mo-Sn oxides have very good alcohol-sensing properties at working temperature-significantly lower than that of pure SnO 2 . X-ray diffraction (XRD) and electron spin resonance (ESR) experiments 20 revealed the formation of a solid solution of Mo-Sn oxides, where the SnO 2 crystal lattice contains stabilized interstitial Mo ions.…”

Section: Mixed Mo-sn Oxidesmentioning

confidence: 87%

“…X-ray diffraction (XRD) and electron spin resonance (ESR) experiments 20 revealed the formation of a solid solution of Mo-Sn oxides, where the SnO 2 crystal lattice contains stabilized interstitial Mo ions. A small fraction of these ions can be transformed from the main oxidation state Mo(VI) to Mo(V) by capturing the conductivity electrons localized in oxygen vacancies.…”

Section: Mixed Mo-sn Oxidesmentioning

confidence: 99%

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Investigation of thin films of mixed oxides for gas‐sensing applications

Kačiulis¹,

Pandolfi²,

Viticoli³

et al. 2002

Surface & Interface Analysis

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Recently, the thin films of some mixed metal oxides (Mo, Ti, Sn, W, etc.) have been indicated as very promising materials for gas-sensing applications. Nevertheless, there is still a significant lack of experimental information on these compounds, where the surface properties can be defined not only by their chemical composition but also by the nanosized morphology of the films.In this study we report the results of XPS investigations of Mo-Ti, Mo-Sn and Mo-W oxides. The films of mixed oxides with different composition ratios were prepared by sol-gel and magnetron sputtering techniques. The gas sensitivity of the films at different temperatures was studied by measuring the electrical response to typical gases.Selected-area XPS depth profiling of the samples was carried out by using cyclic Ar + sputtering. The separation of different chemical species of the same element and quantitative analysis of experimental depth profiles enabled us to reveal completely the chemical composition of the films investigated. In such a way, the samples of mixed oxides, prepared by two different techniques and annealed at different temperatures (450-700• C), were characterized and compared.

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Section: Mixed Mo-sn Oxidesmentioning

confidence: 87%

Section: Mixed Mo-sn Oxidesmentioning

confidence: 99%

Investigation of thin films of mixed oxides for gas‐sensing applications

Kačiulis¹,

Pandolfi²,

Viticoli³

et al. 2002

Surface & Interface Analysis

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show abstract

“…The sensitivity of such material to NO 2 may be attributed to variable oxidation states of Mo in near surface layers. Initially Mo has + 6 oxidation state in a precursor (Table 1), but it has been shown that in SnO 2 ÀMoO 3 systems it easily converts to Mo + 5 state [19][20][21][22]:…”

Section: H 2 S Sensingmentioning

confidence: 99%

Selectivity Modification of SnO₂‐Based Materials for Gas Sensor Arrays

et al. 2010

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“…In this situation, it would be reasonable to think that adsorption of oxygen molecules could not be done by the same mechanism of SnO , which would explain the low response of WO to CO and CH . On the other hand, W atoms could be assigned as a chemisorption site for NO detection since In and Mo have been assigned like this in In O and MoO , respectively [27].…”

Section: B Sensor Devices: Gas-sensing Propertiesmentioning

confidence: 99%

Structural and gas-sensing properties of WO/sub 3/ nanocrystalline powders obtained by a sol-gel method from tungstic acid

et al. 2002

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Abstract-WO 3 nanocrystalline powders were obtained from tungstic acid following a sol-gel process. Evolution of structural properties with annealing temperature was studied by X-ray diffraction and Raman spectroscopy. These structural properties were compared with those of WO 3 nanopowders obtained by the most common process of pyrolysis of ammonium paratungstate, usually used in gas sensors applications. Sol-gel WO 3 showed a high sensor response to NO 2 and low response to CO and CH 4 . The response of these sensor devices was compared with that of WO 3 obtained from pyrolysis, showing the latter a worse sensor response to NO 2 . Influence of operating temperature, humidity, and film thickness on NO 2 detection was studied in order to improve the sensing conditions to this gas.

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On the role of catalytic additives in gas-sensitivity of SnO2-Mo based thin film sensors

Cited by 50 publications

References 8 publications

Investigation of thin films of mixed oxides for gas‐sensing applications

Investigation of thin films of mixed oxides for gas‐sensing applications

Selectivity Modification of SnO₂‐Based Materials for Gas Sensor Arrays

Structural and gas-sensing properties of WO/sub 3/ nanocrystalline powders obtained by a sol-gel method from tungstic acid

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On the role of catalytic additives in gas-sensitivity of SnO2-Mo based thin film sensors

Cited by 50 publications

References 8 publications

Investigation of thin films of mixed oxides for gas‐sensing applications

Investigation of thin films of mixed oxides for gas‐sensing applications

Selectivity Modification of SnO2‐Based Materials for Gas Sensor Arrays

Structural and gas-sensing properties of WO/sub 3/ nanocrystalline powders obtained by a sol-gel method from tungstic acid

Contact Info

Product

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Selectivity Modification of SnO₂‐Based Materials for Gas Sensor Arrays