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High quality double wall carbon nanotubes synthesized by RF chemical vapor deposition

Abstract:

High quality double wall carbon nanotubes (DWCNTs) were synthesized by radiofrequency catalytic chemical vapor deposition from methane on a novel Fe-Mo/MgO catalyst obtained by co-precipitation. A thorough characterization of the nanotubes was done by electron microscopy (TEM), thermogravimetrical analysis and Raman spectroscopy. High Resolution TEM provided information regarding the morphological structure of the double wall carbon nanotubes, while Raman spectroscopy evidenced the existence of nanotubes with diameters between 2.42 to 0.72 nm and that the 2D band is composed of two peaks corresponding to the inner and outer nanotubes. A final purity of over 95 % was obtained by following a simple two-stage purification process. It was also found that RF escitation of the catalyst system considerably suppresses the formation of amorphous carbon and therefore leading to high quality DWCNT samples suitable for advanced applications.