The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Christopher M. Day - One of the best experts on this subject based on the ideXlab platform.
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A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating
MRS Proceedings, 2011Co-Authors: Feng Jin, Scott A. Little, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm 2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an Oxide cathode. © 2009 Materials Research Society.
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Enhanced field emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:The authors report a field emitter structure based on barium strontium\nOxide coated carbon nanotubes (CNTs). This emitter consists of a\nthin tungsten ribbon with CNTs on the surface, and a thin layer of\nlow work function barium strontium Oxide Coating on the CNTs. CNTs\nwere grown on the surface of the tungsten ribbon by plasma enhanced\nchemical vapor deposition, and the Oxide Coatings were prepared using\nmagnetron sputtering. This Oxide coated CNT emitter was designed\nto combine the benefits of the high field enhancement factor from\nCNTs and the low work function from the emissive Oxide Coating. The\nfield emission properties of the emitters were characterized. A field\nenhancement factor of 478 and a work function of 1.9 eV were obtained\nfor the Oxide coated CNTs. As a result of the reduction of surface\nwork function, the field emission from the Oxide coated CNTs increased\nby a factor of 2–3 compared to the uncoated CNTs. At 4.4 V/µm, the\nfield emission current of 23.6 µA was obtained from an emitting surface\nof 0.012 cm2.
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Enhanced electron emission from functionalized carbon nanotubes with a barium strontium Oxide Coating produced by magnetron sputtering
Carbon, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:Carbon nanotubes (CNTs) were functionalized with a surface Coating using magnetron sputter deposition. The CNT samples used were prepared by plasma enhanced chemical vapor deposition and were vertically aligned to the surface of the tungsten substrate. A thin layer of barium strontium Oxide approximately 100 nm in thickness was deposited on their surface using magnetron sputtering. The Oxide Coating was uniform, covering the whole surface of the CNTs and significantly lowered the work function while preserving the geometry. The resulting Oxide coated CNTs had a work function of 1.9 eV and a field enhancement factor of 467, which led to a significant improvement in both field and thermionic emission. Compared to uncoated CNTs, the field emission was increased by a factor of two, while the thermionic emission increased by more than four orders of magnitude. At 4.4 V/μm, a field emission current of 23.6 μA was obtained from an emitting surface of 0.012 cm2. Similarly, at 1.1 V/μm and 1221 K, a thermionic emission current of 14.6 mA was obtained. © 2006 Elsevier Ltd. All rights reserved.
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Thermionic emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Applied Physics Letters, 2006Co-Authors: Feng Jin, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon, carbon nanotubes(CNTs) on the ribbon surface, and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNTcathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 2.1 eV were obtained. At 1437 K , a thermionic emissioncurrent density of 15 mA ∕ cm 2 in an electric field of 0.9 V ∕ μ m was obtained, which is 50 times greater than the emission current density from the uncoated CNTcathode at the same temperature.
Feng Jin - One of the best experts on this subject based on the ideXlab platform.
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A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating
MRS Proceedings, 2011Co-Authors: Feng Jin, Scott A. Little, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm 2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an Oxide cathode. © 2009 Materials Research Society.
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Enhanced field emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:The authors report a field emitter structure based on barium strontium\nOxide coated carbon nanotubes (CNTs). This emitter consists of a\nthin tungsten ribbon with CNTs on the surface, and a thin layer of\nlow work function barium strontium Oxide Coating on the CNTs. CNTs\nwere grown on the surface of the tungsten ribbon by plasma enhanced\nchemical vapor deposition, and the Oxide Coatings were prepared using\nmagnetron sputtering. This Oxide coated CNT emitter was designed\nto combine the benefits of the high field enhancement factor from\nCNTs and the low work function from the emissive Oxide Coating. The\nfield emission properties of the emitters were characterized. A field\nenhancement factor of 478 and a work function of 1.9 eV were obtained\nfor the Oxide coated CNTs. As a result of the reduction of surface\nwork function, the field emission from the Oxide coated CNTs increased\nby a factor of 2–3 compared to the uncoated CNTs. At 4.4 V/µm, the\nfield emission current of 23.6 µA was obtained from an emitting surface\nof 0.012 cm2.
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Enhanced electron emission from functionalized carbon nanotubes with a barium strontium Oxide Coating produced by magnetron sputtering
Carbon, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:Carbon nanotubes (CNTs) were functionalized with a surface Coating using magnetron sputter deposition. The CNT samples used were prepared by plasma enhanced chemical vapor deposition and were vertically aligned to the surface of the tungsten substrate. A thin layer of barium strontium Oxide approximately 100 nm in thickness was deposited on their surface using magnetron sputtering. The Oxide Coating was uniform, covering the whole surface of the CNTs and significantly lowered the work function while preserving the geometry. The resulting Oxide coated CNTs had a work function of 1.9 eV and a field enhancement factor of 467, which led to a significant improvement in both field and thermionic emission. Compared to uncoated CNTs, the field emission was increased by a factor of two, while the thermionic emission increased by more than four orders of magnitude. At 4.4 V/μm, a field emission current of 23.6 μA was obtained from an emitting surface of 0.012 cm2. Similarly, at 1.1 V/μm and 1221 K, a thermionic emission current of 14.6 mA was obtained. © 2006 Elsevier Ltd. All rights reserved.
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Thermionic emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Applied Physics Letters, 2006Co-Authors: Feng Jin, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon, carbon nanotubes(CNTs) on the ribbon surface, and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNTcathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 2.1 eV were obtained. At 1437 K , a thermionic emissioncurrent density of 15 mA ∕ cm 2 in an electric field of 0.9 V ∕ μ m was obtained, which is 50 times greater than the emission current density from the uncoated CNTcathode at the same temperature.
Scott A. Little - One of the best experts on this subject based on the ideXlab platform.
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A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating
MRS Proceedings, 2011Co-Authors: Feng Jin, Scott A. Little, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm 2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an Oxide cathode. © 2009 Materials Research Society.
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Enhanced field emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:The authors report a field emitter structure based on barium strontium\nOxide coated carbon nanotubes (CNTs). This emitter consists of a\nthin tungsten ribbon with CNTs on the surface, and a thin layer of\nlow work function barium strontium Oxide Coating on the CNTs. CNTs\nwere grown on the surface of the tungsten ribbon by plasma enhanced\nchemical vapor deposition, and the Oxide Coatings were prepared using\nmagnetron sputtering. This Oxide coated CNT emitter was designed\nto combine the benefits of the high field enhancement factor from\nCNTs and the low work function from the emissive Oxide Coating. The\nfield emission properties of the emitters were characterized. A field\nenhancement factor of 478 and a work function of 1.9 eV were obtained\nfor the Oxide coated CNTs. As a result of the reduction of surface\nwork function, the field emission from the Oxide coated CNTs increased\nby a factor of 2–3 compared to the uncoated CNTs. At 4.4 V/µm, the\nfield emission current of 23.6 µA was obtained from an emitting surface\nof 0.012 cm2.
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Enhanced electron emission from functionalized carbon nanotubes with a barium strontium Oxide Coating produced by magnetron sputtering
Carbon, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:Carbon nanotubes (CNTs) were functionalized with a surface Coating using magnetron sputter deposition. The CNT samples used were prepared by plasma enhanced chemical vapor deposition and were vertically aligned to the surface of the tungsten substrate. A thin layer of barium strontium Oxide approximately 100 nm in thickness was deposited on their surface using magnetron sputtering. The Oxide Coating was uniform, covering the whole surface of the CNTs and significantly lowered the work function while preserving the geometry. The resulting Oxide coated CNTs had a work function of 1.9 eV and a field enhancement factor of 467, which led to a significant improvement in both field and thermionic emission. Compared to uncoated CNTs, the field emission was increased by a factor of two, while the thermionic emission increased by more than four orders of magnitude. At 4.4 V/μm, a field emission current of 23.6 μA was obtained from an emitting surface of 0.012 cm2. Similarly, at 1.1 V/μm and 1221 K, a thermionic emission current of 14.6 mA was obtained. © 2006 Elsevier Ltd. All rights reserved.
Yan Liu - One of the best experts on this subject based on the ideXlab platform.
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A New Thermionic Cathode Based on Carbon Nanotubes with a Thin Layer of Low Work Function Barium Strontium Oxide Surface Coating
MRS Proceedings, 2011Co-Authors: Feng Jin, Scott A. Little, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon; carbon nanotubes (CNTs) on the ribbon surface; and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNT cathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 1.9 eV were obtained. At 1221 K, a thermionic emission current density of 1.22A/cm 2 in an electric field of 1.1 V/μm was obtained, which is four orders of magnitude greater than the emission current density from the uncoated CNT cathode at the same temperature. The high emission current density at such a modest temperature is among the best ever reported for an Oxide cathode. © 2009 Materials Research Society.
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Enhanced field emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:The authors report a field emitter structure based on barium strontium\nOxide coated carbon nanotubes (CNTs). This emitter consists of a\nthin tungsten ribbon with CNTs on the surface, and a thin layer of\nlow work function barium strontium Oxide Coating on the CNTs. CNTs\nwere grown on the surface of the tungsten ribbon by plasma enhanced\nchemical vapor deposition, and the Oxide Coatings were prepared using\nmagnetron sputtering. This Oxide coated CNT emitter was designed\nto combine the benefits of the high field enhancement factor from\nCNTs and the low work function from the emissive Oxide Coating. The\nfield emission properties of the emitters were characterized. A field\nenhancement factor of 478 and a work function of 1.9 eV were obtained\nfor the Oxide coated CNTs. As a result of the reduction of surface\nwork function, the field emission from the Oxide coated CNTs increased\nby a factor of 2–3 compared to the uncoated CNTs. At 4.4 V/µm, the\nfield emission current of 23.6 µA was obtained from an emitting surface\nof 0.012 cm2.
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Enhanced electron emission from functionalized carbon nanotubes with a barium strontium Oxide Coating produced by magnetron sputtering
Carbon, 2007Co-Authors: Feng Jin, Christopher M. Day, Yan Liu, Scott A. LittleAbstract:Carbon nanotubes (CNTs) were functionalized with a surface Coating using magnetron sputter deposition. The CNT samples used were prepared by plasma enhanced chemical vapor deposition and were vertically aligned to the surface of the tungsten substrate. A thin layer of barium strontium Oxide approximately 100 nm in thickness was deposited on their surface using magnetron sputtering. The Oxide Coating was uniform, covering the whole surface of the CNTs and significantly lowered the work function while preserving the geometry. The resulting Oxide coated CNTs had a work function of 1.9 eV and a field enhancement factor of 467, which led to a significant improvement in both field and thermionic emission. Compared to uncoated CNTs, the field emission was increased by a factor of two, while the thermionic emission increased by more than four orders of magnitude. At 4.4 V/μm, a field emission current of 23.6 μA was obtained from an emitting surface of 0.012 cm2. Similarly, at 1.1 V/μm and 1221 K, a thermionic emission current of 14.6 mA was obtained. © 2006 Elsevier Ltd. All rights reserved.
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Thermionic emission from carbon nanotubes with a thin layer of low work function barium strontium Oxide surface Coating
Applied Physics Letters, 2006Co-Authors: Feng Jin, Yan Liu, Christopher M. DayAbstract:We have created a thermionic cathode structure that consists of a thin tungsten ribbon, carbon nanotubes(CNTs) on the ribbon surface, and a thin layer of low work function barium strontium Oxide Coating on the CNTs. This Oxide coated CNTcathode was designed to combine the benefits from the high field enhancement factor from CNTs and the low work function from the emissive Oxide Coating. The field emission and thermionic emission properties of the cathode have been characterized. A field enhancement factor of 266 and a work function of 2.1 eV were obtained. At 1437 K , a thermionic emissioncurrent density of 15 mA ∕ cm 2 in an electric field of 0.9 V ∕ μ m was obtained, which is 50 times greater than the emission current density from the uncoated CNTcathode at the same temperature.
Nianwu Li - One of the best experts on this subject based on the ideXlab platform.
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High-rate lithium–sulfur batteries promoted by reduced graphene Oxide Coating
Chemical Communications, 2012Co-Authors: Nianwu Li, Zibo Hu, Jieming Cao, Chenfei Shen, Mingbo Zheng, Hongling Lu, Ying Shi, Xiaofeng Chang, Guang Ji, Guangbin Ji, Yi ShiAbstract:Lithium-sulfur batteries have a poor rate performance and low cycle stability due to the shuttling loss of intermediate lithium polysulfides. To address this issue, a carbon-sulfur nanocomposite coated with reduced graphene Oxide was designed to confine the polysulfides.
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high rate lithium sulfur batteries promoted by reduced graphene Oxide Coating
Chemical Communications, 2012Co-Authors: Zibo Hu, Chenfei Shen, Mingbo Zheng, Hongling Lu, Xiaofeng Chang, Nianwu Li, Guangbin Ji, Jieming CaoAbstract:Lithium–sulfur batteries have a poor rate performance and low cycle stability due to the shuttling loss of intermediate lithium polysulfides. To address this issue, a carbon–sulfur nanocomposite coated with reduced graphene Oxide was designed to confine the polysulfides.
