Chemical diffusion of oxygen in tin dioxide: Effects of dopants and oxygen partial pressure

The role of oxygen diffusion in the response of individual SnO2 nanowires to this gas is studied. Different oxygen partial pressures lead to strong changes of their electrical resistance, even at room temperature. Since surface models fail to explain the experimentally observed long‐term resistance transients, it is necessary to make a description of the interaction mechanisms between oxygen species and SnO2 nanowires by taking ion diffusion into account. Our model correctly describes the experimentally measured dependence of the nanowire resistance with oxygen partial pressure, and it can be applied to the characterization of other metal oxide materials.

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“…Similar behavior was reported in the past with thin film SnO 2 sensors. [20][21][22][23][24][25][26] …”

Section: Full Papermentioning

confidence: 99%

“…Similar analyses were successfully reported in the past to justify drift processes in SnO 2 thick and thin film sensors. [20][21][22][23][24][25][26] The results obtained with SnO 2 were corroborated by ZnO nanowires.…”

Section: Introductionmentioning

confidence: 96%

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO₂ Nanowires

Hernández-Ramírez

Prades

Tarancón

et al. 2008

Adv Funct Materials

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“…In the case of FTO, a decrease in conductivity, however, has been reported for high fluorine contents, which was assumed to be due to the occurrence of fluorine interstitial acceptors. 14,15 On the other hand, anomalies in electrical conductivity measurements of pure and slightly acceptor-doped SnO 2 samples as a function of oxygen partial pressure and dilatation measurements 16 hint to the presence of cation vacancies at elevated temperatures.…”

Section: Introductionmentioning

confidence: 99%

Limits for n-type doping in In2O3 and SnO2: A theoretical approach by first-principles calculations using hybrid-functional methodology

Ágoston

Körber

Klein

et al. 2010

Journal of Applied Physics

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The intrinsic n-type doping limits of tin oxide ͑SnO 2 ͒ and indium oxide ͑In 2 O 3 ͒ are predicted on the basis of formation energies calculated by the density-functional theory using the hybrid-functional methodology. The results show that SnO 2 allows for a higher n-type doping level than In 2 O 3 . While n-type doping is intrinsically limited by compensating acceptor defects in In 2 O 3 , the experimentally measured lower conductivities in SnO 2 -related materials are not a result of intrinsic limits. Our results suggest that by using appropriate dopants in SnO 2 higher conductivities similar to In 2 O 3 should be attainable.

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“…The O -ions are highly reactive. The reactivity of superoxide is also high, though much lower compared to O - [52][53][54][55][56]. By means of discussed oxygen species, the CO molecules from gas phase can be directly oxidized.…”

Section: Catalytic Activity Of Basno 3 and Pt/basno 3 Catalysts In Oxmentioning

confidence: 99%

CO and H2 oxidation over Pt/BaSnO3 catalysts

Kocemba

Długołęcka

Wróbel-Jędrzejewska

et al. 2017

Reac Kinet Mech Cat

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This work reports the results of the studies on oxidation of carbon monoxide and H 2 over Pt supported on barium stannate (BaSnO 3 -perovskite type oxide). The composition and properties of Pt/BaSnO 3 catalysts were characterized by X-ray diffraction (XRD), time-of-flight secondary ion mass spectrometry (TOF-SIMS), H 2 and CO chemisorption, scanning electron microscopy with energy dispersive X-ray spectroscopy (SEM-EDS) and tested in the reactions of carbon monoxide and hydrogen oxidation. It was stated that platinum strongly interacts with BaSnO 3 . The catalytic activity and adsorption properties of Pt/BaSnO 3 catalysts are determined by these interactions. The presence of different species (which generally can be labelled as [(Pt)BaSnO 3 ]) resulting from platinum and BaSnO 3 chemical interaction was found by the TOF-SIMS on surface of Pt/BaSnO 3 catalysts. The mechanism of CO and H 2 oxidation over Pt/BaSnO 3 catalysts was discussed in the light of strong interactions between Pt and BaSnO 3 .

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Chemical diffusion of oxygen in tin dioxide: Effects of dopants and oxygen partial pressure

Cited by 45 publications

References 29 publications

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO₂ Nanowires

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO₂ Nanowires

Limits for n-type doping in In2O3 and SnO2: A theoretical approach by first-principles calculations using hybrid-functional methodology

CO and H2 oxidation over Pt/BaSnO3 catalysts

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Chemical diffusion of oxygen in tin dioxide: Effects of dopants and oxygen partial pressure

Cited by 45 publications

References 29 publications

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO2 Nanowires

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO2 Nanowires

Limits for n-type doping in In2O3 and SnO2: A theoretical approach by first-principles calculations using hybrid-functional methodology

CO and H2 oxidation over Pt/BaSnO3 catalysts

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Product

Resources

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Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO₂ Nanowires

Insight into the Role of Oxygen Diffusion in the Sensing Mechanisms of SnO₂ Nanowires