Etching and cutting of multi-walled carbon nanotubes in molten nitrate

Selective etching in molten nitrate was used to cut multi-walled carbon nanotubes (MWCNTs). These MWCNTs were cut into different lengths by controlling the etching temperature and time. Short MWCNTs (s-MWCNTs) with opened ends and rough surfaces were obtained. The decrease in ID/IG ratio in the Raman spectra suggested that a better graphitic structure of s-MWCNTs was developed because of selective etching and removal of the amorphous carbon and tube wall defects. The s-MWCNTs formed more stable suspensions in the polar solvents than did the pristine MWCNTs. The electrochemical results showed an enhancement in capacitive performance with the shortening of MWCNTs.

Selective etching in molten salts was used to cut multi-walled carbon nanotubes (MWCNTs). These MWCNTs were cut into different lengths by controlling the etching temperature and time.Figure optionsDownload as PowerPoint slideHighlights
► Long and entangled MWCNTs were cut short by etching in molten nitrate.
► Short MWCNTs with different lengths and rough surfaces were obtained.
► The s-MWCNTs formed a homogeneous and stable dispersion in the polar solvents.
► The capacitive performance of the s-MWCNTs was greatly improved.