CO and NH3 sensor properties and paramagnetic centers of nanocrystalline SnO2 modified by Pd and Ru

Marikutsa, Artem; Rumyantseva, M. N.; Gaskov, Alexander; Константинова, Е. А.; Grishina, Diana; Deygen, D. M.

doi:10.1016/j.tsf.2011.04.176

Cited by 23 publications

(51 citation statements)

References 26 publications

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“…2e). It agrees with the temperature range of improved CO sensitivity of PdO x -modified tin dioxide 14,20 . In the interaction with NH 3 two temperature regions could be outlined.…”

Section: Simultaneous Work Function and Resistance Measurementssupporting

confidence: 83%

“…Initial PdO x reduction resulting in the increase of Pd 0 amount. This reaction was shown to proceed partially and reversibly 14,20 :…”

Section: Role Of Catalytic Clusters In Selective Tin Dioxide To Co Anmentioning

confidence: 99%

“…Close values of 1882 -1820 cm -1 were reported for Ru 3+ -bound NO on titania-and ZnO-supported catalysts 34 . Up to 20 at.% of modifier was initially in the Ru 3+ state in SnO 2 /RuO y ( Table 1) that could serve as the specific NO adsorption sites, however it was shown to be readily and irreversibly oxidized after NH 3 exposure or sample heating in air 20 .…”

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

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Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

2015

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The processes of selective interactions of gas sensitive nanocrystalline tin dioxide modified by catalytic PdO x and RuO y clusters with ppm-range concentrations of CO and NH 3 in air was studied.From simultaneous in situ work function and resistance measurements it was deduced that the modifiers promote specific interaction of gas molecules with the materials surface. In situ DRIFT studies revealed a key role of catalytic clusters in the selective gas-solid interactions. Specific CO chemisorption on Pd-sites was observed at room temperature. It is assumed to facilitate further oxidation of the molecules on the surface of SnO 2 /PdO x providing its low-temperature sensitivity to carbon monoxide. The selectivity of SnO 2 /RuO y to ammonia is due to the modifier-catalyzed deep oxidation of NH 3 molecules, which was evidenced by the evolvement of Ru-bound nitrosyl species during the interaction at raised temperature. The possible routes were suggested for specific SnO 2 /PdO x -CO and SnO 2 /RuO y -NH 3 interactions as a summary of experimental observations.

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“…2e). It agrees with the temperature range of improved CO sensitivity of PdO x -modified tin dioxide 14,20 . In the interaction with NH 3 two temperature regions could be outlined.…”

Section: Simultaneous Work Function and Resistance Measurementssupporting

confidence: 83%

“…Initial PdO x reduction resulting in the increase of Pd 0 amount. This reaction was shown to proceed partially and reversibly 14,20 :…”

Section: Role Of Catalytic Clusters In Selective Tin Dioxide To Co Anmentioning

confidence: 99%

Section: Acs Paragon Plus Environmentmentioning

confidence: 99%

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Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

2015

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“…The washed SnO2· nH2O deposit was dried at 50 °C overnight and annealed in air at 300 °C for 24 h. Chemical modification of nanocrystalline tin dioxide by 1 wt.% of PdOx or RuOy was performed via the impregnation of as-obtained SnO2 powder by ethanol solution of noble metal acetylacetonate precursors. The impregnated samples, SnO2/Pd(acac)2 and SnO2/Ru(acac)3, were calcined at 225 °C and 265 °C , respectively, to decompose the modifier precursors at a sufficiently lower temperature [25,26].…”

Section: Methodsmentioning

confidence: 99%

“…The micrographs of the nanocomposites were obtained using high-resolution transmission electron microscopy (HRTEM), high angle annular dark field scanning transmission electron microscopy (HAADF-STEM), and energy-dispersive X-ray (EDX) analysis with a Tecnai G2 transmission electron microscope operated at 200 kV. Characterization of the samples by X-ray diffraction (XRD), electron diffraction (ED), X-ray absorption spectroscopy (XANES and EXAFS), X-ray photoelectron spectroscopy (XPS), and electron paramagnetic resonance (EPR) were described in our previous publications [23][24][25][26][27]. The composition and microstructure parameters of the samples are summarized in Table 1.…”

Section: Methodsmentioning

confidence: 99%

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

2015

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This paper is aimed at selectivity investigation of gas sensors, based on chemically modified nanocrystalline tin dioxide in the detection of CO and ammonia mixtures in air. Sol-gel prepared tin dioxide was modified by palladium and ruthenium oxides clusters via an impregnation technique. Sensing behavior to CO, NH3 and their mixtures in air was studied by in situ resistance measurements. Using the appropriate match of operating temperatures, it was shown that the reducing gases mixed in a ppm-level with air could be discriminated by the noble metal oxide-modified SnO2. Introducing palladium oxide provided high CO-sensitivity at 25-50 °C . Tin dioxide modified by ruthenium oxide demonstrated increased sensor signals to ammonia at 150-200 °C , and selectivity to NH3 in presence of higher CO concentrations.

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Design, Synthesis and Application of Metal Oxide-Based Sensing Elements: A Chemical Principles Approach

Krivetskiy

Rumyantseva

Gaskov

2012

Metal Oxide Nanomaterials for Chemical Sensors

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CO and NH3 sensor properties and paramagnetic centers of nanocrystalline SnO2 modified by Pd and Ru

Cited by 23 publications

References 26 publications

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Design, Synthesis and Application of Metal Oxide-Based Sensing Elements: A Chemical Principles Approach

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CO and NH3 sensor properties and paramagnetic centers of nanocrystalline SnO2 modified by Pd and Ru

Cited by 23 publications

References 26 publications

Specific Interaction of PdOx- and RuOy-Modified Tin Dioxide with CO and NH3 Gases: Kelvin Probe and DRIFT Studies

Specific Interaction of PdOx- and RuOy-Modified Tin Dioxide with CO and NH3 Gases: Kelvin Probe and DRIFT Studies

Selectivity of Catalytically Modified Tin Dioxide to CO and NH3 Gas Mixtures

Design, Synthesis and Application of Metal Oxide-Based Sensing Elements: A Chemical Principles Approach

Contact Info

Product

Resources

About

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies

Specific Interaction of PdO_x- and RuO_y-Modified Tin Dioxide with CO and NH₃ Gases: Kelvin Probe and DRIFT Studies