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A single-walled carbon nanotubes (SWCNT) can be envisioned as strip of a graphene molecule (a single sheet of graphite) rolled and joined into a seamless cylinder.The structure of the nanotube can be characterized by the width of this hypothetical strip (that is, the circumference c or diameter d of the tube) and the angle α of the strip relative to the main symmetry axes of the hexagonal ...
On some carbon nanotubes, there is a closed zigzag path that goes around the tube. One says that the tube is of the zigzag type or configuration, or simply is a zigzag nanotube . If the tube is instead encircled by a closed armchair path, it is said to be of the armchair type , or an armchair nanotube .
Carbon nanotubes are the strongest and stiffest materials yet discovered in terms of tensile strength and elastic modulus respectively. This strength results from the covalent sp 2 bonds formed between the individual carbon atoms. In 2000, a multi-walled carbon nanotube was tested to have a tensile strength of 63 gigapascals (9,100,000 psi).
A nanotube is a nanoscale cylindrical structure with a hollow core, typically composed of carbon atoms, though other materials can also form nanotubes. Carbon nanotubes (CNTs) are the most well-known and widely studied type, consisting of rolled-up sheets of graphene with diameters ranging from about 1 to tens of nanometers and lengths up to ...
The two most common formations are zig-zag, which has a (n, 0) bend, and armchair, which has a (n, n) bend. Both the size of the nanotubes and the rolling of the nanotube play a part in the properties of any given GaNNT. The structural properties of a GaNNT begin with the lattice constant, c, of the unit cell of a GaNNT.
Carboxyl-modified single-walled carbon nanotubes (so called zig-zag, armchair type) can act as sensors of atoms and ions of alkali metals Na, Li, K. [168] In May 2005, Nanomix Inc. placed on the market a hydrogen sensor that integrated carbon nanotubes on a silicon platform.
If m = 0, the CNTs are called ‘zigzag’, and when n = m, the CNTs are called ‘armchair’. Otherwise, the CNTs are simply ‘chiral’. The hydrophobic walls of the carbon nanotubes accelerate the flow of water molecules through the tube as they "slip" whenever they come in contact with the walls. The water molecules are driven through the ...
Carbon nanotubes can be grown on a modified substrate to allow separate electrical contacts to each nanostructure. This nanotube growth is accomplished by lithographically placing metal traces separated by insulator material, and connecting those traces to individual catalyst sites on the substrate surface.