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Ask AI3: What is nanotube?
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These sheets are rolled at specific and discrete (" chiral ") angles, and the combination of the rolling angle and radius decides the nanotube properties ; for example, whether the individual nanotube shell is a metal or semiconductor.
There is no consensus on some terms describing carbon nanotubes in scientific literature: both "- wall " and "- walled " are being used in combination with " single ", " double ", " triple " or " multi ", and the letter C is often omitted in the abbreviation ; for example, multi-walled carbon nanotube ( MWNT ).
The ( n, m ) nanotube naming scheme can be thought of as a vector ( C < sub > h </ sub >) in an infinite graphene sheet that describes how to " roll up " the graphene sheet to make the nanotube.
A scanning tunneling microscopy image of single-walled carbon nanotube
A transmission electron microscopy image of a single-walled carbon nanotube
The diameter of an ideal nanotube can be calculated from its ( n, m ) indices as follows
SWNTs are an important variety of carbon nanotube because most of their properties change significantly with the ( n, m ) values, and this dependence is non-monotonic ( see Kataura plot ).
Triple-walled armchair carbon nanotube
In the Russian Doll model, sheets of graphite are arranged in concentric cylinders, e. g., a ( 0, 8 ) single-walled nanotube ( SWNT ) within a larger ( 0, 17 ) single-walled nanotube.
In the case of SWNT, covalent functionalization will break some C = C double bonds, leaving " holes " in the structure on the nanotube and, thus, modifying both its mechanical and electrical properties.
In theory, a nanotorus is a carbon nanotube bent into a torus ( doughnut shape ).
In this new material, fullerene-like " buds " are covalently bonded to the outer sidewalls of the underlying carbon nanotube.
Efficient energy transfer occurs between the encapsulated dye and nanotube — light is absorbed by the dye and without significant loss is transferred to the SWCNT.
* CNTFET ( Carbon nanotube field-effect transistor )
Construction of a high temperature proton exchange membrane fuel cell | PEMFC: Bipolar plate as electrode with in-milled gas channel structure, fabricated from conductive composite material | composite s ( enhanced with graphite, carbon black, carbon fiber, and / or carbon nanotube s for more conductivity ); Porous carbon papers ; reactive layer, usually on the polymer membrane applied ; polymer membrane. Condensation of water produced by a PEMFC on the air channel wall.
* Carbon nanotube
* Carbon nanotube
Following nearly a decade's worth of research into the formation of alternate fullerene compounds ( e. g. C < sub > 28 </ sub >, C < sub > 70 </ sub >), as well as the synthesis of endohedral metallofullerenes ( M @ C < sub > 60 </ sub >), reports of the identification of carbon nanotube structures led Smalley to begin investigating the iron-catalyzed synthesis of carbon nanotubes.
Smalley's latest research was focused on carbon nanotubes, specifically focusing on the chemical synthesis side of nanotube research.
An STM image of a single-walled carbon nanotube
However, recent concepts for a space elevator are notable for their plans to use carbon nanotube or boron nitride nanotube based materials as the tensile element in the tether design.

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