Abstract
The morphological variation of multiwall carbon nanotubes (MWNT) in supercritical water oxidation (SCW) was investigated using a transmission electron microscope (TEM) and electron energy-loss spectroscopy (EELS). It was found that the peeling and sharpening of MWNT were influenced by the etching process in SCW oxidation. It was also found that the difference of mean etching rate between two adjoining blocks causes the morphological variation of MWNT. The results show that the change in characteristic energy-loss peaks as a function of total shell numbers along longitudinal axis of individual peeled tube.