Single-Walled Carbon Nanotube

 

Most single-walled nanotubes (SWNT) have a diameter of close to 1 nanometer, with a tube length that can be many thousands of times longer. The structure of a SWNT can be conceptualized by wrapping a one-atom-thick layer of graphite called graphene into a seamless cylinder. The way the graphene sheet is wrapped is represented by a pair of indices (n,m) called the chiral vector. The integers n and m denote the number of unit vectors along two directions in the honeycomb crystal lattice of graphene. If m=0, the nanotubes are called "zigzag". If n=m, the nanotubes are called "armchair". Otherwise, they are called "chiral".Single-walled nanotubes are a very important variety of carbon nanotube because they exhibit important electric properties that are not shared by the multi-walled carbon nanotube (MWNT) variants. Single-walled nanotubes are the most likely candidate for miniaturizing electronics beyond the micro electromechanical scale that is currently the basis of modern electronics. The most basic building block of these systems is the electric wire, and swnts can be excellent conductors.[18] One useful application of swnts is in the development of the first intramolecular field effect transistors (fets). The production of the first intramolecular logic gate using SWNT fets has recently become possible as well.[19] To create a logic gate you must have both a p-FET and an n-FET. Because swnts are p-fets when exposed to oxygen and n-fets when unexposed to oxygen, it is possible to protect half of a SWNT from oxygen exposure, while exposing the other half to oxygen. This results in a single SWNT that acts as a NOT logic gate with both p and n-type fets within the same molecule.

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See nanotubes

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See Nanotubes and buckyballs

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See Nanotubes and buckyballs

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