Interactions of tin oxide surface with O2, H2O AND H2

Yamazoe, Noboru; Fuchigami, Jun; Kishikawa, Masato; Seiyama, Tetsuro

doi:10.1016/0039-6028(79)90411-4

Cited by 791 publications

(376 citation statements)

References 8 publications

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“…Aside from the charge trapped on intrinsic surface states and defects of the oxide lattice, 13 the temperature dependence of the sensor conductance in a dry air atmosphere is dictated by the temperature ranges of stability of the different ionosorbed oxygen species. 14,15 Differences in the conductance dependence with the temperature, observed between the different samples analyzed here, are related to different surface structures and defect density, which determine the sticking coefficient, coverage, and electrical role of the adsorbed species.…”

Section: Fig 2 ͑A͒mentioning

confidence: 92%

Surface states in template synthesized tin oxide nanoparticles

Cabot

Arbiol

Ferré

et al. 2004

Journal of Applied Physics

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Tin-oxide nanoparticles with controlled narrow size distributions are synthesized while physically encapsulated inside silica mesoporous templates. By means of ultraviolet-visible spectroscopy, a redshift of the optical absorbance edge is observed. Photoluminescence measurements corroborate the existence of an optical transition at 3.2 eV. The associated band of states in the semiconductor gap is present even on template-synthesized nanopowders calcined at 800°C, which contrasts with the evolution of the gap states measured on materials obtained by other methods. The gap states are thus considered to be surface localized, disappearing with surface faceting or being hidden by the surface-to-bulk ratio decrease.

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Section: Fig 2 ͑A͒mentioning

confidence: 92%

Surface states in template synthesized tin oxide nanoparticles

Cabot

Arbiol

Ferré

et al. 2004

Journal of Applied Physics

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“…7 Of these negatively charged ions, O − appears on tin oxide surface at a high temperature of about 150°C. 8 Most tin oxide gas sensors are effective only at temperatures above 200°C. 9 One-dimensional ͑1D͒ and quasi-1D metal oxide nanostructures, such as nanowires and nanobelts, have the smallest dimension for effective electron transport and, therefore, may be ideal candidates for translating the gas recognition into an electrical signal.…”

mentioning

confidence: 99%

Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Tao

Wang

et al. 2007

Applied Physics Letters

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Pure SnO 2 and SnO 2 polycrystalline nanofibers doped with multiwall carbon nanotubes ͑MWCNTs͒ are synthesized by electrospinning followed by calcination in air at 500°C. The measurement results by sensors fabricated from these fiber mats at steady state show that the n-type SnO 2 /MWCNT nanofibers are able to detect carbon monoxide at 50 ppm at room temperature, while the pure SnO 2 nanofibers are insensitive up to 500 ppm. The MWCNT doped SnO 2 nanofibers have demonstrated their potentials for wearable room temperature gas sensors with low cost and power consumption.

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“…The increase in gas response at the operating temperatures from 30 o C to 350 o C could be attributed to the fact that the obtained thermal energy was in favor of overcoming the activation energy barrier for the surface chemical reactions between H 2 S molecules and absorbed oxygen species, causing the significant increase of response of gas sensor to H 2 S [34][35][36]. However, when the operating temperature was above 350 o C, the H 2 S gas was consumed within a very shallow surface of the sensing layer, therefore, the utilization rate of the sensing layer was decreased, thus the diffusion depth of the H 2 S gas was decreased [34][35][36].…”

Section: Structural and Morphological Characteristicsmentioning

confidence: 99%

“…However, when the operating temperature was above 350 o C, the H 2 S gas was consumed within a very shallow surface of the sensing layer, therefore, the utilization rate of the sensing layer was decreased, thus the diffusion depth of the H 2 S gas was decreased [34][35][36]. Accordingly, the resistance of sensor was decreased.…”

Section: Structural and Morphological Characteristicsmentioning

confidence: 99%

Facile synthesis of α-Fe2O3 micro-ellipsoids by surfactant-free hydrothermal method for sub-ppm level H2S detection

Lin

Wang

et al. 2016

Materials & Design

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The α-Fe 2 O 3 micro-ellipsoids were prepared using a facile hydrothermal process without any surfactant or template, and their morphological, structural and H 2 S sensing properties were investigated.The α-Fe 2 O 3 showed uniform micro-ellipsoids with a long axis diameter of 1.7 µm and a short axis diameter of 1.2 µm. Detailed structural analysis confirmed that the synthesized α-Fe 2 O 3 micro-ellipsoids were compact particles with a hexagonal structure. Gas sensor base on the α-Fe 2 O 3 micro-ellipsoids showed excellent response, short response/recovery time (less than 90 s and 30 s, respectively), low detection concentration (~0.5 ppm), good long-term stability and excellent selectivity towards H 2 S gas at the optimized operating temperature of 350 o C. The sensing mechanism of the sensor based on the α-Fe 2 O 3 micro-ellipsoids towards H 2 S was discussed.

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Interactions of tin oxide surface with O2, H2O AND H2

Cited by 791 publications

References 8 publications

Surface states in template synthesized tin oxide nanoparticles

Surface states in template synthesized tin oxide nanoparticles

Room temperature gas sensing properties of SnO2/multiwall-carbon-nanotube composite nanofibers

Facile synthesis of α-Fe2O3 micro-ellipsoids by surfactant-free hydrothermal method for sub-ppm level H2S detection

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