| Abstract
| - Single-wall carbon nanohorn (SWNH), which is a tubular particle with a cone cap, was oxidized in an oxygenflow at various temperatures. N2 adsorption at 77 K, thermogravimetry (TG), differential thermal analysis(DTA), transmission electron microscopy, and Raman spectroscopy measurements were carried out on theoxidized SWNHs. The specific surface area of the oxidized SWNHs can be controlled by oxidation temperature,giving the maximum value of 1420 m2/g. The pore size distribution by the BJH method and the comparisonplot of the N2 adsorption isotherms of SWNH oxidized at different temperatures against that of as-grownSWNH revealed the minimum oxidation temperature for opening internal nanopores. TG-DTA analysesdetermined the components of as-grown SWNH: amorphous carbon 2.5 wt %, defective carbon at the conepart 15 wt %, tubular carbon 70 wt %, and graphitic carbon 12 wt %. These systematic analyses provided theexact internal nanopore volume of 0.49 mL/g for pure SWNH particles.
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