CNT yield produced from the radio frequency CVD of acetylene over the catalysts at .
(a) The SEM and (b) TEM images of the nanotubes grown on the catalyst. The high resolution TEM image of the tubes obtained from the (c) and (d) catalysts. The scale bars in (b), (c), and (d) are 5, 10, and 10 nm, respectively.
(a) Thermogravimetrical profiles (sample mass vs temperature) of the nanotubes grown on the systems, and the inset displays the first derivatives of these curves. (b) The variation of the burning temperature , as a function of the catalyst Fe loading.
(a) Raman scattering spectra of the CNTs produced on the catalysts. The typical peak characteristics of MWCNTs are , , , and . Lorentzian deconvolution (inset) of the peak indicates the presence of the peak, which is associated to the disorder in the sample. (b) The variation of the intensity values of the peaks as a function of the Fe loading.
(a) In situ XRD pattern from the under different reduction temperatures. (b) The structure change in the catalyst before and after the reaction.
qMass spectra of the effluent gas obtained during the acetylene CVD on the (a) , (b) , and (c) catalysts. Notice the higher concentrations of benzene generated in monometallic catalysts and . (d) Time evolution of the effluent for the CVD system with the catalyst.
TEM images show the encapsulated metal particles inside the CNTs produced on the monometallic catalysts: (a) , (c) ; the nanotubes grown on the bimetallic catalyst (b) do not have any significant amounts of encapsulated particles inside. The scale bars in (a), (b), and (c) are 20, 100, and 50 nm, respectively.
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