single wall carbon nanotubes
Try to use diffuse reluctance spectroscopy (DRS)
I would recommend an analysis of Kataura's plot related to the diameter of nanotubes with energy gap.
thanks, mr. vollebregt for a nice formula for it. but from where we can find the hopping length (Gamma)
This link may help sir
http://www.instanano.com/characterization/theoretical/uv-vis-spectroscopy-band-gap-calculation/
For a SWCNT, the energy gap is about [2.4-3.3] eV
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