Study on Carbon Nanotubes of Pyrolysis Carbons P for In Situ Catalytic Formation on Expanded Graphite Surface

Fe(NO₃)₃, Co(NO₃)₂, and Ni(NO₃)₂ catalysts were used to form carbon nanotubes in situ from expanded graphite by changing the type, concentration and carbonization temperature of the catalysts. The microstructure, modified expanded graphite functional group and oxidation temperature of the formed carbon nanotubes were detected and analyzed. The effects of catalyst concentration and type, the ratio of carbon source Carbons P to expanded graphite and heat treatment temperature on the in-situ catalytic formation of carbon nanotubes by expanded graphite were studied and characterized by X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), Raman spectrometer (Raman), scanning electron microscope (SEM), and thermogravimetric analysis-differential scanning calorimetry (TG-DSC) in this paper. The formation mechanism and influence rule of different experimental conditions on carbon nanotubes are studied.