We investigate the purification of as-prepared multi- wall carbon nanotubes (MWCNTs)
by exposure to ultraviolet lamp (λ=185 nm). UV irradiation was conducted under
ambient condition in a UV lamp chamber which had a layer of reflective aluminium foil
inside to ensure the entire sample would have an even exposure to UV. Raman
spectroscopy before and after UV exposure indicates the removal of non-nanotube
material. The narrowing of D-band is consistent with highly purified nanotube which is
seen in our results. Raman result shows that the ozone oxidation can remove the defect
site of nanotubes. Intensity of G- and D*- band increases rapidly with increasing the
oxidation time. Intensity ratio ID*/ID increases continually with increasing the ozone
oxidation time which confirm the reduction of impurities from the MWCNTs.
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