Optical Spectroscopy of Individual Single-Walled Carbon Nanotubes of Defined Chiral Structure

Optical Spectroscopy of Individual Single-Walled Carbon Nanotubes of Defined Chiral Structure

Single-Walled Carbon Nanotubes (SWNT) represents the part of single graphene sheets that are rolled to make cylinder capped with hemifullerenes. This condition may also appear in situations whey SWNT does not form by rolling of graphite. Such rolling may create a notable discrete variation in transverse structure that change with respect to change in the angle and tube diameter. Chiral angles are related to the changes that occur in transition energies of semiconducting nano-tubes. Unique SWNT structures are formed in the range of 0 and 30° in a condition when enantiomers are neglected.

Covalent bonding appears among three neighboring atoms in every carbon atom single-walled nanotube structure. Extended p-electron system is made by remaining p-shell electron that joins other sites for governing optical spectroscopy and SWNT low-energy electronic properties. Electronic state components in such a system represent a graphene band structure that form angular full rotation under periodic boundary condition. This rotation occurs in the tube axis. It is the atomic structure that the optical and electronic properties of the nanotube depend on. In order to understand the individual single walled carbon nanotubes, the study used two methods of examination. Each physical SWNT structure possesses distinct characteristic electronic structure. Variation appears due to change in the function boundary condition, highlighting the nanotube's construction.

Valuable importance of SWNT arises due to varying electronic properties and interdependence on nanotube structures. This needs to be considered as an interlinked material instead of a single spectroscopic isotope of carbon, such as C60. Given the before defined explanation of the nanotube structures, these structures are recognized as “armchair” nanotubes based on the bonds formation pattern around the circumference. In “armchair” nanotubes, carbon particles have a ...