Abstract
A temperature window for the synthesis of single-walled carbon nanotubes by catalytic chemical vapor deposition of CH4over Mo2-Fe10/MgO catalyst has been studied by Raman spectroscopy. The results showed that when the temperature is lower than 750 °C, there were few SWCNTs formed, and when the temperature is higher than 950 °C, mass amorphous carbons were formed in the SWCNTs bundles due to the self-decomposition of CH4. The temperature window of SWCNTs efficient growth is between 800 and 950 °C, and the optimum growth temperature is about 900 °C. These results were supported by transmission electron microscope images of samples formed under different temperatures. The temperature window is important for large-scale production of SWCNTs by catalytic chemical vapor deposition method.
Highlights
Since single-walled carbon nanotubes (SWCNTs) were discovered in 1993 [1], they have generated significant research activities due to their particular microstructures, unique properties and great potential applications in many fields
We report the synthesis of SWCNTs by catalytic decomposition of methane over Mo2-Fe10/MgO catalyst and give a temperature window using Raman spectroscopy
In the lower wavenumber region (100–300 cm-1), the radial breath modes (RBM) which represent the existence of SWCNTs are hardly shown
Summary
Since single-walled carbon nanotubes (SWCNTs) were discovered in 1993 [1], they have generated significant research activities due to their particular microstructures, unique properties and great potential applications in many fields. Keywords Single-walled carbon nanotubes Á Catalytic chemical vapor deposition Á Raman spectroscopy We report the synthesis of SWCNTs by catalytic decomposition of methane over Mo2-Fe10/MgO catalyst and give a temperature window using Raman spectroscopy.
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