The Experts below are selected from a list of 318 Experts worldwide ranked by ideXlab platform
Yuanlie Yu - One of the best experts on this subject based on the ideXlab platform.
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fabrication of novel hydrophobic sic sio2 bead string like core shell nanochains via a facile catalyst template free thermal chemical Vapor Deposition Process
Materials Chemistry and Physics, 2018Co-Authors: Bo Zhong, Lingqi Kong, Bin Zhang, Yuanlie YuAbstract:Abstract Novel SiC/SiO2 bead-string like core-shell nanochains have been fabricated via a thermal chemical Vapor Deposition Process without using any catalysts and templates. These SiC/SiO2 bead-string like core-shell nanochains are made up of SiO2 spheres as beads and SiC/SiO2 core-shell nanowires as strings, respectively. A Vapor–Solid growth mechanism is proposed to explain the formation of these SiC/SiO2 hetero-nanostructures in the absence of catalysts on the basis of the characterization results, the possible reactions among the solid phases, intermediate gas phases and surface energy minimization. Moreover, these SiO2-SiC bead-string like nanochains exhibit good hydrophobicity with a water contact angle over 140°, which is caused by the special surface composition. This hydrophobicity makes these SiO2-SiC bead-string like nanochains promising candidates as surface protective or self-cleaning materials in harsh environments.
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Fabrication of novel hydrophobic SiC/SiO2 bead-string like core-shell nanochains via a facile catalyst/template-free thermal chemical Vapor Deposition Process
Materials Chemistry and Physics, 2018Co-Authors: Bo Zhong, Lingqi Kong, Bin Zhang, Yuanlie YuAbstract:Abstract Novel SiC/SiO2 bead-string like core-shell nanochains have been fabricated via a thermal chemical Vapor Deposition Process without using any catalysts and templates. These SiC/SiO2 bead-string like core-shell nanochains are made up of SiO2 spheres as beads and SiC/SiO2 core-shell nanowires as strings, respectively. A Vapor–Solid growth mechanism is proposed to explain the formation of these SiC/SiO2 hetero-nanostructures in the absence of catalysts on the basis of the characterization results, the possible reactions among the solid phases, intermediate gas phases and surface energy minimization. Moreover, these SiO2-SiC bead-string like nanochains exhibit good hydrophobicity with a water contact angle over 140°, which is caused by the special surface composition. This hydrophobicity makes these SiO2-SiC bead-string like nanochains promising candidates as surface protective or self-cleaning materials in harsh environments.
Maheshwar Sharon - One of the best experts on this subject based on the ideXlab platform.
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carbon nanotubes nanofilaments and nanobeads by thermal chemical Vapor Deposition Process
Materials Science and Engineering B-advanced Functional Solid-state Materials, 2002Co-Authors: Debabrata Pradhan, Maheshwar SharonAbstract:Abstract From commercial kerosene, straight and coiled nanotubes, nanofilaments and nanobeads are grown by suitably adjusting pyrolysis temperature and catalysts by the thermal chemical Vapor Deposition (CVD) technique. Nickel and iron facilitate the growth of straight and coiled nanotubes, respectively, at a temperature of 1000 °C. With an increase of pyrolysis temperature to 1100 °C, carbon nanobeads resulted in the presence of both the catalysts. Although, coiled nanotubes are formed at 900 °C in the presence of iron catalysts but nickel gives nanofilaments of diameter in the range 80–100 nm at the same temperature. The crystallinity and thermal properties are studied.
Bo Zhong - One of the best experts on this subject based on the ideXlab platform.
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fabrication of novel hydrophobic sic sio2 bead string like core shell nanochains via a facile catalyst template free thermal chemical Vapor Deposition Process
Materials Chemistry and Physics, 2018Co-Authors: Bo Zhong, Lingqi Kong, Bin Zhang, Yuanlie YuAbstract:Abstract Novel SiC/SiO2 bead-string like core-shell nanochains have been fabricated via a thermal chemical Vapor Deposition Process without using any catalysts and templates. These SiC/SiO2 bead-string like core-shell nanochains are made up of SiO2 spheres as beads and SiC/SiO2 core-shell nanowires as strings, respectively. A Vapor–Solid growth mechanism is proposed to explain the formation of these SiC/SiO2 hetero-nanostructures in the absence of catalysts on the basis of the characterization results, the possible reactions among the solid phases, intermediate gas phases and surface energy minimization. Moreover, these SiO2-SiC bead-string like nanochains exhibit good hydrophobicity with a water contact angle over 140°, which is caused by the special surface composition. This hydrophobicity makes these SiO2-SiC bead-string like nanochains promising candidates as surface protective or self-cleaning materials in harsh environments.
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Fabrication of novel hydrophobic SiC/SiO2 bead-string like core-shell nanochains via a facile catalyst/template-free thermal chemical Vapor Deposition Process
Materials Chemistry and Physics, 2018Co-Authors: Bo Zhong, Lingqi Kong, Bin Zhang, Yuanlie YuAbstract:Abstract Novel SiC/SiO2 bead-string like core-shell nanochains have been fabricated via a thermal chemical Vapor Deposition Process without using any catalysts and templates. These SiC/SiO2 bead-string like core-shell nanochains are made up of SiO2 spheres as beads and SiC/SiO2 core-shell nanowires as strings, respectively. A Vapor–Solid growth mechanism is proposed to explain the formation of these SiC/SiO2 hetero-nanostructures in the absence of catalysts on the basis of the characterization results, the possible reactions among the solid phases, intermediate gas phases and surface energy minimization. Moreover, these SiO2-SiC bead-string like nanochains exhibit good hydrophobicity with a water contact angle over 140°, which is caused by the special surface composition. This hydrophobicity makes these SiO2-SiC bead-string like nanochains promising candidates as surface protective or self-cleaning materials in harsh environments.
Mark Borysiak - One of the best experts on this subject based on the ideXlab platform.
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graphene films with large domain size by a two step chemical Vapor Deposition Process
Nano Letters, 2010Co-Authors: Xuesong Li, Mark Borysiak, Jinho An, Archana Venugopal, Carl W. Magnuson, Aruna Velamakanni, Lianfeng Fu, Eric M Vogel, Edgar Voelkl, Luigi ColomboAbstract:The fundamental properties of graphene are making it an attractive material for a wide variety of applications. Various techniques have been developed to produce graphene and recently we discovered the synthesis of large area graphene by chemical Vapor Deposition (CVD) of methane on Cu foils. We also showed that graphene growth on Cu is a surface-mediated Process and the films were polycrystalline with domains having an area of tens of square micrometers. In this paper, we report on the effect of growth parameters such as temperature, and methane flow rate and partial pressure on the growth rate, domain size, and surface coverage of graphene as determined by Raman spectroscopy, and transmission and scanning electron microscopy. On the basis of the results, we developed a two-step CVD Process to synthesize graphene films with domains having an area of hundreds of square micrometers. Scanning electron microscopy and Raman spectroscopy clearly show an increase in domain size by changing the growth parameters...
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Graphene films with large domain size by a two-step chemical Vapor Deposition Process
Nano Letters, 2010Co-Authors: Xuesong Li, Boyang Han, Ji Won Suk, Jinho An, Archana Venugopal, Carl W. Magnuson, Mark BorysiakAbstract:The fundamental properties of graphene are making it an attractive material for a wide variety of applications. Various techniques have been developed to produce graphene and recently we discovered the synthesis of large area graphene by chemical Vapor Deposition (CVD) of methane on Cu foils. We also showed that graphene growth on Cu is a surface-mediated Process and the films were polycrystalline with domains having an area of tens of square micrometers. In this paper, we report on the effect of growth parameters such as temperature, and methane flow rate and partial pressure on the growth rate, domain size, and surface coverage of graphene as determined by Raman spectroscopy, and transmission and scanning electron microscopy. On the basis of the results, we developed a two-step CVD Process to synthesize graphene films with domains having an area of hundreds of square micrometers. Scanning electron microscopy and Raman spectroscopy clearly show an increase in domain size by changing the growth parameters. Transmission electron microscopy further shows that the domains are crystallographically rotated with respect to each other with a range of angles from about 13 to nearly 30°. Electrical transport measurements performed on back-gated FETs show that overall films with larger domains tend to have higher carrier mobility up to about 16,000 cm(2) V(-1) s(-1) at room temperature.
L. Thomas - One of the best experts on this subject based on the ideXlab platform.
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Identification of influence factors in a thermal model of a plasma-assisted chemical Vapor Deposition Process
Inverse Problems in Science and Engineering, 2007Co-Authors: S. Rouquette, L. Autrique, C. Chaussavoine, L. ThomasAbstract:This study is focused on several stages of an identification methodology and consists of selection of the parameters of influence and their identification considering state observations. A partial differential equations system describing the temperature evolution in a plasma-assisted chemical Vapor Deposition Process is investigated. A preliminary study based upon the numerical design of experimental method leads to determination of the parameters which have to be carefully estimated since their uncertainties sharply reduce the adequacy of the model. Then, a sensitivity analysis is performed and the sensitivity problem derived from the direct problem is solved. Optimal observation strategy is briefly discussed in order to obtain state observations for the unknown parameters identification, and a conjugate gradient method is implemented for the resolution of the ill-posed inverse problem.
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3D thermal modeling of a plasma assisted chemical Vapor Deposition Process
Proceedings of the 2002 American Control Conference (IEEE Cat. No.CH37301), 2002Co-Authors: S. Rouquette, L. Autrique, C. Chaussavoine, L. ThomasAbstract:Due to unique properties such as hardness, or a low friction coefficient, amorphous silicon carbide films are attractive for mechanical applications. Even if plasma assisted chemical Vapor Deposition Processes are now commonly used for the growth of such coatings, mechanisms leading to their formations are not completely understood. However, the substrate temperature is considered as one of the key-parameters for this technique. Then in order to provide an effective predictive simulation tool or to determine optimal control procedures, a 3D thermal modeling of the plasma assisted chemical Vapor Deposition Process has to be investigated.
