The catalytic graphitization of thermal plastic phenolic-formaldehyde resin with the aid of ferric nitrate(FN) was studied in detail.The morphologies and structural features of the products including onion-like carbon nanoparticles and bamboo-shaped carbon nanotubes were investigated by transmission electron microscopy(TEM),high-resolution transmission electron microscopy(HRTEM),X-ray diffraction and Raman spectroscopy measurements.It was found that with the changes of loading content of FN and residence time at 1000 ℃,the products exhibited various morphologies.The TEM images showed that bamboo-shaped carbon nanotube consisted of tens of bamboo sticks and onion-like carbon nanoparticle was made up of quasi-spherically concentrically closed carbon nanocages.
