Results 231 to 240 of about 4,127 (270)

One-dimensionality of phonon transport in cup-stacked carbon nanofibers

Journal of Physics: Condensed Matter, 2010
We treat the ballistic heat conduction of cup-stacked carbon nanofibers (CSCNF) by a nonequilibrium molecular dynamics simulation. The CSCNF consist of numerous tiny graphene cups linked in line by weak intermolecular forces. The simulation results show that the thermal conductivity varies with the fiber length in a power law fashion with an exponent ...
Y, Ito, M, Inoue, K, Takahashi
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Cup‐Stacked Carbon Nanotube Schottky Diodes for Photovoltaics and Photodetectors

Advanced Materials, 2014
High performance optoelectronic devices based on cup-stacked carbon nanotubes are realized. Based on a Schottky barrier model, rectifying behaviors and high photoresponse are observed by using growth catalysts as nanoscale electronic contacts. Similar performances are also obtained and furthermore tuned by using nanotube’s defective surface as ...
Ki-Hwan, Kim, David, Brunel, Aurelien, Gohier, Leandro, Sacco, Marc, Châtelet, Costel-Sorin, Cojocaru   +5 more
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Controlled synthesis of uniform cup-stacked carbon nanotubes for energy applications

Journal of Alloys and Compounds, 2021
Abstract While carbon nanotubes (CNTs) have been widely used for various energy storage and conversion applications, controlled synthesis of CNTs with desired properties at low cost is still a challenge. Here we report our findings in the development of a controlled synthesis of uniform cup-stacked carbon nanotubes (CSCNTs) using a chemical vapor ...
Yuexia Li, Zhuojie Xiao, Hao Wu, Huichi Zhong, Yaxing Liu, Guizhe Zhao, Yaqing Liu, Jianhuang Zeng   +7 more
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Graphene unrolled from ‘cup-stacked’ carbon nanotubes

Carbon, 2012
Abstract High quality graphene with a large area and smooth edges has been obtained by unrolling the so-called ‘cup-stacked’ carbon nanotubes (CSCNTs) by the solution-phase oxidation and reduction. Atomic force microscopy and transmission electron microscopy observations reveal that the obtained graphene layers can even have a size of 20 μm in width ...
Qingfeng Liu, Tsuyohiko Fujigaya, Naotoshi Nakashima   +2 more
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Fluorination of Cup-stacked Carbon Nanotubes, Structures and Properties

MRS Proceedings, 2004
ABSTRACTCup-stacked carbon nanotubes (Cup-CNTs) was fluorinated in a temperature range RT-500• •by 0.5–1 atm elemental fluorine. The F/C atomic ratio (CF0.4-CF1.2) and the color are strongly dependent on the fluorination conditions. The color of fluorinated Cup-CNTs (F-Cup-CNTs) varies from black, through gray and yellow to white.
Hidekazu Touhara, Akiko Yonemoto, Kazunao Yamamoto, Shingo Komiyama, Shinji Kawasaki, Fujio Okino, Takashi Yanagisawa, Morinobu Endo   +7 more
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A reversible strain-induced electrical conductivity in cup-stacked carbon nanotubes

Nanoscale, 2013
We have used in situ current-voltage measurements of cup-stacked carbon nanotubes (CSCNTs) to establish reversible strain induced (compressive bending) semiconducting to metallic behavior. The corresponding electrical resistance decreases by two orders of magnitude during the process, and reaches values comparable to those of highly crystalline multi ...
Takuya, Hayashi, Thomas C, O'Connor, Katsuhisa, Higashiyama, Kohei, Nishi, Kazunori, Fujisawa, Hiroyuki, Muramatsu, Yoong Ahm, Kim, Bobby G, Sumpter, Vincent, Meunier, Mauricio, Terrones, Morinobu, Endo   +10 more
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Electrochemical properties of oxygenated cup-stacked carbon nanofiber-modified electrodes

Phys. Chem. Chem. Phys., 2014
The electrochemical reaction kinetics of Fe2+/3+ and [Fe(CN)6]3−/4− is tunable by controlling the oxygen/carbon atomic ratio at the CSCNF surface.
Seongjae, Ko, Tetsu, Tatsuma, Akiyoshi, Sakoda, Yasuyuki, Sakai, Kikuo, Komori   +4 more
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Analysis of Stacking Structure of Cup-Stacked Type Carbon Nanofibers

MRS Proceedings, 2002
ABSTRACTThe lattice images of the new type (cup-stacked type) carbon nanofibers were observed by high resolution transmission electron microscopy (HRTEM) and the detailed structure was analyzed by image processing. The angle of opposed graphitic basal planes was measured from power spectrum obtained by 2 dimensional first Fourier transform.
Kyoich Oshida, Tatsuo Nakazawa, Kozo Osawa, Takuya Hayashi, Morinobu Endo, Takashi Yanagisawa, Mildred S. Dresselhaus   +6 more
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Structure and basic properties of cup-stacked type carbon nanofiber

Molecular Crystals and Liquid Crystals, 2002
Structural characterization of novel nanofibers, so called "cup-stacked type carbon nanofibers" with large hollow core and their potential applications are described as compared with those of tubular type of nanotubes and nanofibers. This novel carbon nanofiber containing peculiar features provide the variety of carbon nanotubes and nanofibers from ...
Takashi Yanagisawa, Takuya Hayashi, Yoong Ahm Kim, Yasuo Fukai, Morinobu Endo   +4 more
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Microstructural change of cup-stacked carbon nanofiber by post-treatment

Molecular Crystals and Liquid Crystals, 2002
Structural changes of truncated graphitic conical graphene layers (cups) stacked carbon nanofiber by post-treatment, such as oxidation and heat treatment, are described in terms of microstructure and morphology.
Yoong Ahm Kim, Takuya Hayashi, Yasuo Fukaiand, Morinobu Endo, Takashi Yanagisawa   +4 more
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