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Nitrogen-, phosphorous- and boron-doped carbon nanotubes (N-CNTs, P-CNTs and B-CNTs) were prepared by a chemical vapor deposition method using xylene as carbon source and aniline-NH 3 , triphenyl phosphine and triethyl borate as nitrogen, phosphorous and boron precursors, respectively. By tailoring the composition of reactants and reaction atmosphere, N-CNTs with nitrogen contents from 0%...
It is demonstrated that functionalization of single-wall carbon nanotubes (SWCNTs) can be carried out using simple chlorosilane chemistry, which allows coupling of the SWCNTs with external chemical species. As a result, organic polymers and magnetically iron oxide-in-silica nanoparticles are specifically bonded onto SWCNTs. It is also found that the SWCNTs functionalized with long PEG chains greatly...
The influence of the reaction atmosphere on the type of single-walled carbon nanotubes (SWNT) grown during chemical vapor deposition (CVD) was investigated. Methane decomposition was catalyzed by Fe/MgO and Fe–Mo/MgO catalysts in argon, nitrogen and their mixtures. Nitrogen influences the carbon species significantly. The aggregation of iron nanoparticles in nitrogen results in the growth of N-doped...
Carbon nanotubes (CNTs) were prepared by ethylene decomposition on an Fe/Al 2 O 3 catalyst in a fluidized bed reactor. Their gross defects at different growth periods are evaluated by using a combination of SEM, TGA and Raman spectroscopy. The initially grown CNTs have a much lower thermal stability and more defects as compared to the fully-grown ones. The difference in the defects...
The synthesis of carbon nanotubes (CNTs) from ethylene decomposition by Fe/Al 2 O 3 and Fe/Ni/Al 2 O 3 catalysts (Fe:Ni=10:1) is studied. A small amount of nickel introduced into the catalyst can significantly increase the yield of CNTs, but the nanotubes change from straight tubes with concentric parallel carbon sheets to helical tubes of the fish-bone type. Raman...
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