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We do an experiment to prepare the carbon nanotubes. One of the factors affecting the preparation of carbon nanotubes was studied in the article. The experimental results were described by scanning electron microscopy and Raman spectroscopy. The results show that Hydrogen plays important role in the grown of carbon nanotubes and the best Hydrogen Flow of the carbon nanotubes is 30sccm.doi:10.24214/jcbps.c.8.1.00106 fatcat:wsuxgluh2jbt5ipdkdlls2acru