Abstract
The one-step method of carbon nanotubes filled with continuous cobalt nanowires (CoF-CNT) synthesis is presented. Co/ZSM-5 (8 wt% Co) was used as catalyst for CoF-CNT production by methane decomposition at the temperature of 400 °C and 800 °C at atmospheric pressure in a conventional gas-flow system. The average diameter of the CoF-CNT is about 25 and 40 nm for products obtained at 400 °C and at 800 °C, respectively. The average size of coherently scattering domains along the normal to graphite layers L c , the interlayer spacing d 002, the graphitization degree of carbon, and the relative intensities of the G and D bands in Raman spectroscopy were determined to characterize the quality of carbon. It was proved that cobalt-filled carbon nanotubes can be produced by a simple method. The results of XRD, FE-SEM, and TEM show that CoF-CNT can be obtained even at 400 °C by catalytic decomposition of methane. On the basis of XRD, TEM, Raman spectroscopy was found that at a temperature of 800 °C, a better quality of carbon was produced.
Highlights
The initial studies on carbon nanotubes (CNTs) filled with metals were carried out in 1993 by Iijima [1], which demonstrated the successful encapsulation of Pb
We show that the Co/ZSM-5 prepared by the impregnation method can be used as catalysts of CNT filled with continuous cobalt nanowires (CoF-CNT) growth from methane decomposition even at the temperature of 400 °C
Transmission Electron Microscope (TEM) analysis of CoF-CNT obtained at 400 and 800 °C showed the presence of cobalt nanorods encapsulated inside the carbon tubes
Summary
The initial studies on carbon nanotubes (CNTs) filled with metals were carried out in 1993 by Iijima [1], which demonstrated the successful encapsulation of Pb. Some authors reported on methane to carbon nanotubes or nanoparticles decomposition over cobalt contained catalysts [8, 9], but to the best of our knowledge, there is no information on nanotubes filled with continuous cobalt nanowires prepared from methane. We show that the Co/ZSM-5 prepared by the impregnation method can be used as catalysts of CNT filled with continuous cobalt nanowires (CoF-CNT) growth from methane decomposition even at the temperature of 400 °C. This is the one-step method that is simpler and cheaper than the others described up to now
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