Abstract
Multiple wall carbon nanotubes (MWCNTs) decorated with Fe nanoparticles (Fe-NPs) have been produced on diamond film on cemented carbide substrate (MWCNTs/Fe-NPs/diamond/cemented carbide) by the pyrolysis of FePC at 850°C, 880°C and 940°C, respectively. During the growth process, the growth of MWCNTs is accompanied by the formation of Fe-NPs encapsuled by layers of graphitic carbon. With the increasing temperatures, the structural defects of MWCNTs are improved enormously and the evolution of the MWCNT/Fe-NP/diamond/cemented carbide film morphology is ascribed to the steric hindrance between nanotubes. The diffusion of carbon atoms (vapor) in Fe catalysis (liquid) is bulk (volumetric) diffusion in the synthesis of MWCNT/Fe-NP/diamond/cemented carbide substrate, which is testified on the analysis of the sample grown at the temperature of 940°C. The growth of the MWCNTs/Fe-NPs/is well explained using the concepts of the vapor–liquid–solid (VLS) model.
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