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purified with a combination of thermal oxidation and acid treatment. Typically, MWNTs (1g) were heated in a furnace to 350¡ãC for 2h to remove amorphous carbon and then the remaining sample was refluxed in concentrated hydrochloric acid (HCl) for 24h to remove the metal catalyst. After filtration, the remaining solids were washed repeatedly, to neutral pH, with deionized water and dried under vacuum.
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