Electronic structure of carbon nanotubes

Efficient Isolation and Solubilization of Pristine Single‐Walled Nanotubes in Bile Salt Micelles

“…The dispersions were not perfectly stable (some sedimentationÐalbeit possibly due to impuritiesÐwas noticeable after a few days), but the absorbance scaled linearly with added concentration of SWNT material, indicating that dissolution was close to complete. In order to be able to compare the absorbances of the HiPco tubes with those of the arc-SWNTs, which have a different diameter distribution, we assumed that the oscillator strength of the lowest energy absorption band scales with the total nanotube length (in line with the theoretical scaling of the joint density of states with length [46]), in other words, with the ratio mass/diameter. After subtraction of a 1/k background (setting OD(472 nm) = 0), the first and second van Hove transitions, plotted on an energy scale, were approximated as two Gaussian bands.…”

Electronic and vibrational properties of chemically modified single-wall carbon nanotubes

“…Electronic density of states of the (10, 10) armchair tube derived from zone-folding. Data taken from [122]. follows [115]:…”

Soft X‐Ray Absorption and Emission Spectroscopy in the Studies of Nanomaterials

“…In both graphite and CNTs, the hybridization of C atoms is sp 2 type. In graphite the π orbitals are perpendicular to the graphene plane, while in CNTs the π orbitals are oriented along the normal to the nanotube surface and thus are not parallel to each other due to the surface bending [67]. They mix with σ orbitals of the neighboring sites, and such mixing would affect the band structure of CNTs.…”