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SEM images of carbon nanotubes grown on the substrate with different substrate orientations and growth time. (a) Downwards, . (b) Downwards, . (c) Upwards, .
(a) Raman spectrum of the vertical carbon nanotubes (CNTs) in Fig. 1(a) . The radial breathing mode (RBM) signals in the range of indicate that the CNTs are single-walled carbon nanotubes (SWCNTs). (b) TEM image of individual SWCNTs. The diameter of a SWCNT is . (c) TEM image of bundle SWCNTs. The diameter of a SWCNT is .
SEM images of single-walled carbon nanotubes (SWCNTs) grown on with Si(100) surface normal pointing (a) downwards and (b) 45° downwards. Their corresponding growth mechanisms are sketched in (c) and (d), respectively. The gravity helps SWCNTs to precipitate at the bottom of the metal drops and to line up with the direction of gravity in both substrate orientations.
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