Author/Authors :
Daisuke Shimamoto، نويسنده , , Kazunori Fujisawa، نويسنده , , Hiroyuki Muramatsu، نويسنده , , Takuya Hayashi، نويسنده , , Yoong-Ahm Kim، نويسنده , , Takahashi Yanagisawa، نويسنده , , Morinobu Endo، نويسنده , , Mildred S. Dresselhaus.، نويسنده ,
Abstract :
A simple but effective way of producing short cup-stacked carbon nanotubes with high quality is demonstrated using sonication in an ethanol/distilled water mixture. The substantial removal of amorphous carbon deposited on the truncated conical layer-stacked nanotubes by controlled air oxidation was a critical precondition to cut the nanotubes without substantial structural degradation. The short nanotubes (below 1 μm) prepared by a sonication-generated shear force exhibited a narrow length distribution (median length = 0.2 μm) and chemically active edges in the outer surface, thereby resulting in high dispersibility in an aqueous solution.
