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HiPco single-walled carbon nanotube (HCNT) containing about 30wt% of Fe were purified by the 2-step process of air oxidation and successive washing with hydrochloric acid. The surface chemistry and pore structures of HCNT aggregates before and after purification were examined by X-ray photoelectron spectroscopy (XPS) and N 2 adsorption at 77K. XPS results show that the purification treatment...
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