摘要
Multi-walled carbon nanotubes (MWNTs) with 20 nm outer diameter were prepared by chemical vapor deposition of ethylene using ultrafine surface-modified acicular a-Fe catalyst particles. The growth mechanism of MWNTs on the larger catalyst particles are attributed to the interaction between the Fe nanoparticles with the surface-modified silica layer. This interaction-mediated growth mechanism is illustrated by studying the electronic, atomic and crystal properties of surface-modified catalysts and MWNTs products by characterization with X-ray diffraction (XRD), transmis-sion electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), thermal gravimetric analy-sis (TGA) and Raman spectra.
Multi-walled carbon nanotubes (MWNTs) with 20 nm outer diameter were prepared by chemical vapor deposition of ethylene using ultrafine surface-modified acicular a-Fe catalyst particles. The growth mechanism of MWNTs on the larger catalyst particles are attributed to the interaction between the Fe nanoparticles with the surface-modified silica layer. This interaction-mediated growth mechanism is illustrated by studying the electronic, atomic and crystal properties of surface-modified catalysts and MWNTs products by characterization with X-ray diffraction (XRD), transmis-sion electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), thermal gravimetric analy-sis (TGA) and Raman spectra.
基金
support of the National Natural Science Foundation of China(No.50071057,No.20236020)
the National High Technology Research and Development Program(863 Program)(No.2003AA302630)
