The Experts below are selected from a list of 300 Experts worldwide ranked by ideXlab platform
Li Wenchao - One of the best experts on this subject based on the ideXlab platform.
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Oxygen sensitivity of nano-CeO2 coating TiO2 materials
Sensors and Actuators B-chemical, 2003Co-Authors: Wang Xidong, Wang Fuming, Li WenchaoAbstract:Abstract The oxygen sensitivity of pure TiO2, nano-CeO2 coating micro-TiO2 and nano-CeO2 coating nano-TiO2 materials was investigated in the present work. The experiments showed that the oxygen sensitivity of the nano-CeO2 coating nano-TiO2 materials was much better than that of the pure TiO2 and CeO2 coating micro-TiO2 materials. Thermodynamic analyses and XPS experimental results indicated that CeO2 was easier to be reduced into non-stoichiometric compound than TiO2 under the same change of partial oxygen pressure. With large special surface area and capacity of storing and releasing oxygen while the atmosphere changes, nano-CeO2 is a very good catalyst for the oxygen sensitivity of TiO2.
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Oxygen sensitivity of nano-CeO2 coating TiO2 materials
Sensors and Actuators B: Chemical, 2003Co-Authors: Zhang Mei, Wang Fuming, Wang Xidong, Li WenchaoAbstract:The oxygen sensitivity of pure TiO2, nano-CeO2 coating micro-TiO2 and nano-CeO2 coating nano-TiO2 materials was investigated in the present work. The experiments showed that the oxygen sensitivity of the nano-CeO2 coating nano-TiO2 materials was much better than that of the pure TiO2 and CeO2 coating micro-TiO2 materials. Thermodynamic analyses and XPS experimental results indicated that CeO2 was easier to be reduced into non-stoichiometric compound than TiO2 under the same change of partial oxygen pressure. With large special surface area and capacity of storing and releasing oxygen while the atmosphere changes, nano-CeO2 is a very good catalyst for the oxygen sensitivity of TiO2. ?? 2003 Elsevier Science B.V. All rights reserved.
Zhang Mei - One of the best experts on this subject based on the ideXlab platform.
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Oxygen sensitivity of nano-CeO2 coating TiO2 materials
Sensors and Actuators B: Chemical, 2003Co-Authors: Zhang Mei, Wang Fuming, Wang Xidong, Li WenchaoAbstract:The oxygen sensitivity of pure TiO2, nano-CeO2 coating micro-TiO2 and nano-CeO2 coating nano-TiO2 materials was investigated in the present work. The experiments showed that the oxygen sensitivity of the nano-CeO2 coating nano-TiO2 materials was much better than that of the pure TiO2 and CeO2 coating micro-TiO2 materials. Thermodynamic analyses and XPS experimental results indicated that CeO2 was easier to be reduced into non-stoichiometric compound than TiO2 under the same change of partial oxygen pressure. With large special surface area and capacity of storing and releasing oxygen while the atmosphere changes, nano-CeO2 is a very good catalyst for the oxygen sensitivity of TiO2. ?? 2003 Elsevier Science B.V. All rights reserved.
K. S. Park - One of the best experts on this subject based on the ideXlab platform.
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gas sensing properties of defect controlled zno nanowire gas sensor
Applied Physics Letters, 2008Co-Authors: K. S. Park, K J Choi, June Park, Seonghyeon HongAbstract:The effect of oxygen-vacancy-related defects on gas-sensing properties of ZnO-nanowire gas sensors was investigated. Gas sensors were fabricated by growing ZnO nanowires bridging the gap between two prepatterned Au catalysts. The sensor displayed fast response and recovery behavior with a maximum sensitivity to NO2 gas at 225 °C. Gas sensitivity was found to be linearly proportional to the photoluminescence intensity of oxygen-vacancy-related defects in both as-fabricated and defect-controlled gas sensors by postannealing in Ar and H2 atmosphere. This result agrees well with previous theoretical prediction that oxygen vacancies play a role of preferential adsorption sites for NO2 molecules.
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Gas sensing properties of defect-controlled ZnO-nanowire gas sensor
Applied Physics Letters, 2008Co-Authors: M. W. Ahn, J. H. Heo, D.-w. Kim, K J Choi, J H Lee, K. S. Park, J G Park, S.h. HongAbstract:The effect of oxygen-vacancy-related defects on gas-sensing properties of ZnO-nanowire gas sensors was investigated. Gas sensors were fabricated by growing ZnO nanowires bridging the gap between two prepatterned Au catalysts. The sensor displayed fast response and recovery behavior with a maximum sensitivity to NO2 gas at 225 degrees C. Gas sensitivity was found to be linearly proportional to the photoluminescence intensity of oxygen-vacancy-related defects in both as-fabricated and defect-controlled gas sensors by postannealing in Ar and H-2 atmosphere. This result agrees well with previous theoretical prediction that oxygen vacancies play a role of preferential adsorption sites for NO2 molecules.
Wang Xidong - One of the best experts on this subject based on the ideXlab platform.
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Oxygen sensitivity of nano-CeO2 coating TiO2 materials
Sensors and Actuators B-chemical, 2003Co-Authors: Wang Xidong, Wang Fuming, Li WenchaoAbstract:Abstract The oxygen sensitivity of pure TiO2, nano-CeO2 coating micro-TiO2 and nano-CeO2 coating nano-TiO2 materials was investigated in the present work. The experiments showed that the oxygen sensitivity of the nano-CeO2 coating nano-TiO2 materials was much better than that of the pure TiO2 and CeO2 coating micro-TiO2 materials. Thermodynamic analyses and XPS experimental results indicated that CeO2 was easier to be reduced into non-stoichiometric compound than TiO2 under the same change of partial oxygen pressure. With large special surface area and capacity of storing and releasing oxygen while the atmosphere changes, nano-CeO2 is a very good catalyst for the oxygen sensitivity of TiO2.
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Oxygen sensitivity of nano-CeO2 coating TiO2 materials
Sensors and Actuators B: Chemical, 2003Co-Authors: Zhang Mei, Wang Fuming, Wang Xidong, Li WenchaoAbstract:The oxygen sensitivity of pure TiO2, nano-CeO2 coating micro-TiO2 and nano-CeO2 coating nano-TiO2 materials was investigated in the present work. The experiments showed that the oxygen sensitivity of the nano-CeO2 coating nano-TiO2 materials was much better than that of the pure TiO2 and CeO2 coating micro-TiO2 materials. Thermodynamic analyses and XPS experimental results indicated that CeO2 was easier to be reduced into non-stoichiometric compound than TiO2 under the same change of partial oxygen pressure. With large special surface area and capacity of storing and releasing oxygen while the atmosphere changes, nano-CeO2 is a very good catalyst for the oxygen sensitivity of TiO2. ?? 2003 Elsevier Science B.V. All rights reserved.
Alexander Star - One of the best experts on this subject based on the ideXlab platform.
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Decorated carbon nanotubes with unique oxygen sensitivity
Nature Chemistry, 2009Co-Authors: Douglas R. Kauffman, Chad M. Shade, Hyounsoo Uh, Stephane Petoud, Alexander StarAbstract:The relatively simple and robust architecture of microelectronic devices based on carbon nanotubes, in conjunction with their environmental sensitivity, places them among the leading candidates for incorporation into ultraportable or wearable chemical analysis platforms. We used single-walled carbon nanotube (SWNT) networks to establish a mechanistic understanding of the solid-state oxygen sensitivity of a Eu3+-containing dendrimer complex. After illumination with 365 nm light, the SWNT networks decorated with the Eu3+ dendrimer show bimodal (optical spectroscopic and electrical conductance) sensitivity towards oxygen gas at room temperature under ambient pressure. We investigated the mechanism of this unique oxygen sensitivity with time-resolved and steady-state optical spectroscopy, analysis of excited-state luminescence lifetimes and solid-state electrical transport measurements. We demonstrate a potential application of this system by showing a reversible and linear electrical response to oxygen gas in the tested range (5–27%). Carbon-nanotube networks have been used to study the sensitivity to molecular oxygen of a dendrimer complexed with europium ions. Optically transparent devices made by coating nanotubes with the metal-containing dendrimer show a linear and reversible electrical response to O2, and may prove useful for oxygen-sensing applications.
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Decorated carbon nanotubes with unique oxygen sensitivity
Nature Chemistry, 2009Co-Authors: Douglas R. Kauffman, Chad M. Shade, Hyounsoo Uh, Stephane Petoud, Alexander StarAbstract:The relatively simple and robust architecture of microelectronic devices based on carbon nanotubes, in conjunction with their environmental sensitivity, places them among the leading candidates for incorporation into ultraportable or wearable chemical analysis platforms. We used single-walled carbon nanotube (SWNT) networks to establish a mechanistic understanding of the solid-state oxygen sensitivity of a Eu(3+)-containing dendrimer complex. After illumination with 365 nm light, the SWNT networks decorated with the Eu(3+) dendrimer show bimodal (optical spectroscopic and electrical conductance) sensitivity towards oxygen gas at room temperature under ambient pressure. We investigated the mechanism of this unique oxygen sensitivity with time-resolved and steady-state optical spectroscopy, analysis of excited-state luminescence lifetimes and solid-state electrical transport measurements. We demonstrate a potential application of this system by showing a reversible and linear electrical response to oxygen gas in the tested range (5-27%).
