Synthesis of NiO-embedded carbon nanotubes using corona discharge enhanced chemical vapor deposition

Large-scale synthesis of NiO-embedded carbon nanotubes (CNTs) has been achieved using a nanoporous anodic aluminum (AAO) membrane as a template, with the aid of CH4/H2 corona discharge enhanced chemical vapor deposition (CVD). NiO nanoparticles are first introduced into the nanopores of the alumina template through wet impregnation method. The loading of NiO nanoparticles into the CNTs and the synthesis of the CNTs were simultaneously performed in the corona discharge reactor. Transmission electron microscopy characterization showed that the NiO nanoparticles are encapsulated into the walls of the CNTs, but not present on the outer surfaces.