▎ 摘　　要

We tried to unwrap single-walled carbon nanotubes (SWCNTs) by reducing the oxidized SWCNTs. A transmission electron microscope (TEM) observation revealed that the unwrapped SWCNTs were transformed from a pristine nanotube structure to a sheet-like (graphene-like) structure. Electrochemical measurements demonstrated that the electric double layer capacitance (EDLC) of SWCNTs increases significantly due to the unwrapping treatment. For example, the EDLC (199 F/g) of the unwrapped SWCNTs in 1M H2SO4 electrolyte at a current rate of 50 mA/g is about four times greater than that (51.9 F/g) of pristine SWCNTs. (C) 2011 The Japan Society of Applied Physics