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Showing papers on "Carbon nanotube published in 1992"


Journal ArticleDOI
01 Jul 1992-Nature
TL;DR: In this article, the authors used a variant of the standard arc-discharge technique for fullerene synthesis under a helium atmosphere, where a carbonaceous deposit formed on one of the graphite rods, consisting of a macroscopic (diameter of about 5 mm) cylinder.
Abstract: INTEREST in carbon fibres1,2 has been stimulated greatly by the recent discovery of hollow graphitic tubules of nanometre dimensions3. There has been much speculation about the properties and potential application of these nanotubes4–8. Theoretical studies predict that their electronic properties will depend on their diameter and degree of helicity4,5. Experimental tests of these ideas has been hampered, however, by the lack of macroscopic quantities of the material. Here we report the synthesis of graphitic nanotubes in gram quantities. We use a variant of the standard arc-discharge technique for fullerene synthesis under a helium atmosphere. Under certain conditions, a carbonaceous deposit forms on one of the graphite rods, consisting of a macroscopic (diameter of about 5 mm) cylinder in which the core comprises pure nanotubes and nanoscale particles in high yield. The purity and yield depend sensitively on the gas pressure in the reaction vessel. Preliminary measurements of the conductivity of the bulk nanotube material indicate a conductivity of about 100 S cm–11.

2,908 citations


Book
01 Jan 1992
TL;DR: The main forms are diamond and graphite, and they exhibit markedly different properties from other forms of carbon as mentioned in this paper, such as the properties of carbon nanotubes and carbon nano-graphs.
Abstract: The performance of a single-crystal diamond detector, grown by chemical vapour deposition, as an energy (2) Pierson H. O., Handbook of Carbon, Graphite. Diamonds and Fullerenes: Processing, Properties. Applications. Handbook of carbon, graphite, diamond and fullerenes 1993 Pierson.pdf 4.72 MB Handbook of preparative inorganic chemistry 1963 Vol 1,2 Brauer.pdf. but in other areas, less-ordered graphitic or amorphous carbon shells were also Pierson, H. O. in Handbook of Carbon, Graphite, Diamond and Fullerenes:. At high temperature, Mg can reduce not only carbon in the oxidation state of +4 in Pierson, H. O. Handbook of carbon, graphite, diamonds and fullerenes:. nanotoxicity of carbon nanotubes and graphene in biomedicine. Pierson, H.O. Handbook of Carbon, Graphite, Diamond, and Fullerenes: Properties. Section 4 of the article is devoted towards discussing the role of carbon and its (7) H O Pierson, Handbook of carbon, graphite, diamonds and fullerenes:. The main forms are diamond and graphite, and they exhibit markedly di erent Books Handbook of Carbon, Graphite, Diamond and Fullerenes Properties. Four different forms of carbon namely, Graphite, Activated H. O. Pierson, Handbook of Carbon, Graphite, Diamonds and Fullerenes: Processing, Properties. The growth of multi-walled carbon nanotube (MWCNT) and carbon nano (13) H. O. Pierson, Handbook of Carbon, Graphite, Diamond and Fullerenes:.

575 citations


Journal ArticleDOI
TL;DR: A novel structure that shows complete ``turn around growth,'' involving pentagon-heptagon pairs, of the tubular assemblies is presented.
Abstract: Evidence is presented, through high-resolution electron microscopy images, for the open-end growth of carbon nanotubes Terminations of incomplete layers of carbon, seen on the tube surfaces and cone tips, suggest that the extension and thickening of the tubes occur by the island growth of graphite basal planes on existing tube surfaces The nucleation of positive (pentagons) and negative (heptagons) disclinations on open tube ends results in changes of growth directions, producing different morphologies A novel structure that shows complete ``turn around growth,'' involving pentagon-heptagon pairs, of the tubular assemblies is presented

434 citations


Journal ArticleDOI
Pulickel M. Ajayan1, Sumio lijima1
01 Jul 1992-Nature

244 citations


Journal ArticleDOI
TL;DR: In this article, the authors discuss possible quasi-two-dimensional (2D) carbon solids consisting of carbon nanotubes connected by L, Y, T and X carbon net elements.

97 citations


Journal ArticleDOI
TL;DR: In this article, electron energy-loss spectroscopy of carbon nanotubes was used to investigate the dielectric properties of graphite and showed that the peak energy of the π+σ plasmon energy varies from 22.0 eV to 24.5 eV.
Abstract: Carbon nanotubes were investigated by means of electron energy-loss spectroscopy. Two peaks due to the π plasmon and the π+σ plasmon were observed. The energy of the π+σ plasmon peaks varied from 22.0 eV to 24.5 eV, which roughly agrees with the average plasmon energy of graphite. A shoulder due to single electron excitations was observed at 13 eV, which was not observed in graphite. There were two kinds of nanotubes which exhibited their respective π plasmon peaks at 5.2 eV and 6.4 eV. The peaks in the dielectric function obtained by Kramers-Kronig analysis of the spectra were broader than those of graphite probably due to the curving of the graphitic sheets.

82 citations


Patent
22 Dec 1992
TL;DR: In this paper, the introduction of a foreign substance from the tip of a carbon nanotube by depositing the vapor of the foreign substance on the tip and introducing it into a hollow hole present in the center of the tube according to the thermal diffusion is discussed.
Abstract: PURPOSE:To enable the introduction of a foreign substance from the tip of a carbon nanotube by depositing the vapor of the foreign substance on the tip of the carbon nanotube and introducing the foreign substance into a hollow hole present in the center of the tube according to the thermal diffusion. CONSTITUTION:The vapor of a substance other than carbon, e.g. lead 2 is deposited on the tip of a carbon nanotube 1 and further introduced from the tip of the carbon nanotube 1 into a hollow hole present in the center of the tube according the thermal diffusion. Thereby, the carbon nanotube enclosing the foreign substance is produced. A metal, a superconductor, a semiconductor, a magnetic substance, an organic molecule, a gas, an alkaline metal, etc., are cited as the substance to be enclosed therein. The carbon nanotube enclosing the foreign substance can be expected of practical use as a basic material for devices using a quantum size phenomenon produced within a nanometer region, a basic element for electronic elements having ultrahigh mobility or a high-density recording material reflecting the completeness of the structure of the carbon nanotube or a new electronic material and further application as a new material in the chemical industrial aspects.

19 citations