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Chemical, mechanical, and thermal control of substrate-bound carbon nanotube growth
, 2006
"... Carbon nanotubes (CNTs) are long molecules having exceptional properties, including several times the strength of steel piano wire at one fourth the density, at least five times the ther-mal conductivity of pure copper, and high electrical conductivity and current-carrying capac-ity. This thesis pre ..."
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Carbon nanotubes (CNTs) are long molecules having exceptional properties, including several times the strength of steel piano wire at one fourth the density, at least five times the ther-mal conductivity of pure copper, and high electrical conductivity and current-carrying capac-ity. This thesis presents methods of CNT synthesis by atmospheric-pressure thermal chemical vapor deposition (CVD), where effective choice of the catalyst composition and processing con-ditions enables growth of tangled single-wall CNTs or structures of aligned multi-wall CNTs, on bare silicon, microstructured silicon, and ceramic fibers. Applying mechanical pressure during growth controls the structure of a CNT film while causing significant defects in the CNTs. This mechanochemisty approach is used to "grow-mold " CNTs into 3D-shaped microforms. A new reactor apparatus featuring a resistively-heated suspended platform enables rapid (~100 *C/s) temperature control and versatile in situ characterization, including laser measure-ment of CNT film growth kinetics, and imaging of stress-induced film cracking. By thermally pre-treating the reactant mixture before it reaches the substrate platform, aligned CNTs are
A review on Carbon nano-tubes- A new era of nanotechnology
"... Abstract — Carbon nanotubes, which consist of rolled graphene sheets built from sp 2 hybridized carbon atoms, were reported to be discovered in 1991, and are now attracting researchers from various disciplines due to their alluring physico-chemical properties. The special nature of carbon combines w ..."
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Abstract — Carbon nanotubes, which consist of rolled graphene sheets built from sp 2 hybridized carbon atoms, were reported to be discovered in 1991, and are now attracting researchers from various disciplines due to their alluring physico-chemical properties. The special nature of carbon combines with the molecular perfection of buckytubes to endow them with exceptionally high material properties such as electrical and thermal conductivity, strength, stiffness, and toughness. The delocalised п-electron donated by each atom is free to move about the entire structure, rather than stay home with its donor atom, giving rise to the first molecule with metallic-type electrical conductivity. The high-frequency C-C bond vibrations provide an intrinsic thermal conductivity higher than even diamond. CNTs open incredible applications in diverse aspects of engineering like materials, electronics, chemical processing and energy management and some of these applications are now realized in products. Others are demonstrated in early to advanced devices, and one, hydrogen storage, is clouded by controversy. The purpose of this review report is to provide the reader some insight in the wide range of aspects of chemistry and applications of CNT and, ultimately, some support and guidance for the reader’s own research.
1 Electronic Properties of Nanopore Edges of Ferromagnetic Graphene Nanomeshes at High Carrier Densities under Ionic-Liquid Gating
, 2013
"... Copyright © 2014 Taijyu Hashimoto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In accor-dance of the Creative Commons Attri ..."
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Copyright © 2014 Taijyu Hashimoto et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. In accor-dance of the Creative Commons Attribution License all Copyrights © 2014 are reserved for SCIRP and the owner of the intellectual property Taijyu Hashimoto et al. All Copyright © 2014 are guarded by law and by SCIRP as a guardian. Graphene edges with a zigzag-type atomic structure can theoretically produce spontaneous spin polarization despite being a critical-metal-free material. We have demonstrated this in graphene nanomeshes (GNMs) with honeycomb-like arrays of low-defect hexagonal nanopores by observing room-temperature ferromagnetism and spin-based phenomena arising from the zigzag-pore edges. Here, we apply extremely high electric fields to the ferromagnetic (FM) GNMs using an ionic-liquid gate. A large on/off-ratio for hole current is observed for even small applied ionic-liquid gate voltages (Vig). Observations of the magnetoresistance behavior reveal high carrier densities of ~1013 cm−2 at large Vig values. We find a maximum conductance peak in the high −Vig region and its separation into two peaks upon applying a side-gate (in-plane external) voltage (Vex). It is discussed that localized edge-π band with excess-density electrons induced by Vig and its spin splitting for majority and minority of spins by Vex (half-metallicity model) lead to these phenomena. The results must realize critical-element-free novel spintronic devices.
Acknowledgement
"... The authors are grateful to the MTR Corporation for its support in this study. The authors ..."
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The authors are grateful to the MTR Corporation for its support in this study. The authors
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"... Effect of Peierls transition in armchair carbon nanotube on dynamical behaviour of ..."
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Effect of Peierls transition in armchair carbon nanotube on dynamical behaviour of
Carbon nanotube, Carbon nanotube & Application Correspondence to Author:
"... Carbon nanotubes are the technology that imagination by many scientists in the different country. There are small strengths, dimensions, and the remarkable physical properties of the carbon nanotubes that structures make a very unique material with a whole range of various applications. There are di ..."
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Carbon nanotubes are the technology that imagination by many scientists in the different country. There are small strengths, dimensions, and the remarkable physical properties of the carbon nanotubes that structures make a very unique material with a whole range of various applications. There are discussing some of the important application of materials science use in carbon nanotubes. There are discuss the pharmaceutical applications of nanotubes, electronic and electrochemical application of nanotubes, mechanical strengths of nanotubes in high performance composites and field emitters based upon nanotube. There are another application of nanotubes such as metrology and biological application of nanoprobes and chemical investigations and formation of other nanostructures. Applications of nanotubes device and electronic properties was treated in the book. The challenges that happen after wards in act of realizing then some
Sciences Appliquées de Rouen
, 2015
"... Sciences Physiques, Mathématiques et de l'Information pour l'Ingénieur ..."
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Sciences Physiques, Mathématiques et de l'Information pour l'Ingénieur
