Helical microtubules of graphitic carbon

  title={Helical microtubules of graphitic carbon},
  author={Sumio Iijima},
  • S. Iijima
  • Published 1 November 1991
  • Chemistry
  • Nature
THE synthesis of molecular carbon structures in the form of C60 and other fullerenes1 has stimulated intense interest in the structures accessible to graphitic carbon sheets. Here I report the preparation of a new type of finite carbon structure consisting of needle-like tubes. Produced using an arc-discharge evaporation method similar to that used for fullerene synthesis, the needles grow at the negative end of the electrode used for the arc discharge. Electron microscopy reveals that each… 
X-ray diffraction study of carbon microtubules
The synthesis of molecular carbon structures in the form of C60 and other fullerenes [1] has stimulated intense interest in the structure accessible to graphitic carbon sheets. High resolution
Ultrathin graphitic structures and carbon nanotubes in a purified synthetic graphite.
  • P. Harris
  • Materials Science, Medicine
    Journal of physics. Condensed matter : an Institute of Physics journal
  • 2009
A new class of carbon structure is reported, which consists of microscale graphitic shells bounded by curved and faceted planes containing two to five layers, believed to form during a purification process which involves passing an electric current through the graphite in the presence of a reactive gas.
Synthesis and structure of carbon nanotubes
The distribution, morphology and structure of carbon nanotubes and buckyonions produced from an arc discharge were investigated by means of scanning electron microscopy and high-resolution
Cobalt-catalysed growth of carbon nanotubes with single-atomic-layer walls
CARBON exhibits a unique ability to form a wide range of structures. In an inert atmosphere it condenses to form hollow, spheroidal fullerenes1–4. Carbon deposited on the hot tip of the cathode of
Electronic Structure of Fullerene Tubules
The synthesis of macroscopic amounts of the fullerenes C60 and C70 and the availability of these materials has led to an explosive growth of research efforts in novel all-carbon materials.1,2 Less
Growth of carbon nanotubes
Large-scale synthesis of carbon nanotubes
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
Carbon nanocones: wall structure and morphology
The carbon nanocones are found to exhibit several interesting structural features; instead of having a uniform cross-section, the walls consist of a relatively thin inner graphite-like layer with a non-crystalline envelope, where the amount of the latter can be modified significantly by annealing.
Group of Carbon
Crystalline Ropes of Metallic Carbon Nanotubes
X-ray diffraction and electron microscopy showed that fullerene single-wall nanotubes (SWNTs) are nearly uniform in diameter and that they self-organize into “ropes,” which consist of 100 to 500 SWNTs in a two-dimensional triangular lattice with a lattice constant of 17 angstroms.


Why are carbon filaments tubular
C60: Buckminsterfullerene
During experiments aimed at understanding the mechanisms by which long-chain carbon molecules are formed in interstellar space and circumstellar shells1, graphite has been vaporized by laser
Growth, Structure, and Properties of Graphite Whiskers
Graphite whiskers have been grown in a dc arc under a pressure of 92 atmospheres of argon and at 3900°K. They are embedded in a solid matrix of graphite which builds up by diffusion of carbon vapor
Solid C60: a new form of carbon
A new form of pure, solid carbon has been synthesized consisting of a somewhat disordered hexagonal close packing of soccer-ball-shaped C60 molecules. Infrared spectra and X-ray diffraction studies
Space, Stars, C60, and Soot
The intriguing revelation that 12 pentagonal "defects" convert a planar hexagonal array of any size into a quasi-icosahedral cage explains why some intrinsically planar materials form quasi-crystalline particles, as appears to occur in the case of soot.
Cohesive mechanism and energy bands of solid C60.
  • Saito, Oshiyama
  • Materials Science, Medicine
    Physical review letters
  • 1991
We present microscopic total-energy calculations which provide a cohesive property and electronic structures of a new form of solid carbon, the face-centered-cubic ${\mathrm{C}}_{60}$ crystal (fcc