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TEM and Raman characterization. (a, b) High-resolution TEM images of the carbon nanotubes grown on top of the alumina membrane with S1813 photoresist. A relatively thin wall consisting of 10 atomic carbon layers can be seen in (b). (c, d) The Raman spectra of the nanotube grown using C2H4 and C2H2 precursors show D and G bands and a relatively low presence of defects.
