SWCNT and SWCNTs nano-tubes Application of karyal vector (tubular vector) based on nano-microelectronics PHD
(educational-research doctorate)
Researcher and author PhD student: Afshin Rashid
Note: Two parameters are used to describe the SWCNT structure. One is the Ch, which is oriented from the main atom of the catarrhal vector to the next atom, and is also called the tubular vector, and its length is equal to the circumference of the nanotube circle.
The face of the graffiti pages with a polygonal grid imagined to be cylindrical. Nanotubes are characterized by the number of layers that make up their cylindrical walls ; single-walled SWCNTs carbon nanotubes and multi-walled carbon nanotubes (MWCNTs , SWCNT) are obtained from a specific graphene plate . Due to the cylindrical symmetry , we can only pipe it in one direction so that the two atoms are aligned. Two parameters are used to describe the structure of SWCNT . Two parameters are used to describe the structure of SWCNT. One is Ch, which starts from the main atom of the carrier vector to the next atom and It is also called tubular vector and its length is equal to the circumference of the nanotube circle and is defined by the following relation:
Ch = na1 + ma2≡ (n, m) 1)
Network vectors of graphene and here the numbers are correct. Another is the Cyrillic angle, the intermediate angle in the graphene network. Ch and the direction of the karyal Similarly, the correct numbers (m, n) of the nanotube and the angle of the kyril can be shown in terms of diameter . The nanotube diameter is based on structural indices (m, n).
The distance between two atoms in this adjacent equation is also expressed in graphite and the karyal angle is expressed by the following equation.
( θ = tan-1] √3m / (m + 2n)]
Therefore, a nanotube can be identified either by continuous indices. Kirals are optically active and can have two unequal spiral orientations. The piping process can be done both from above and below the graphene plate. The two tubes will be mirror images of each other, and in this case, the graphene screen is the mirror screen. These two modes create round left and right isomers. In the case of crystal nanotubes, this plate is called the reflection plate, and the two nanotubes are equivalent.
Conclusion:
It can be concluded that when s WCNT is metallic and in other cases semi-conductive. This is entirely dependent on geometry, one-third of which are metal SWCNTs and two-thirds of which are semiconductors. Nanotubes single walled compounds are exceptional because they can be either metallic or semiconducting , while no difference between them in relation electrochemical between the carbon atoms inside the tube there are no impurities or the presence of foreign substances added has not seen.