Fig. 17

CVD based growth of CNTs produced using different diameter nanoparticle catalyst. a SEM images of CNTs produced with different diameters (250 nm and 20 nm in diameter) using nickel-coated glass substrates. Adapted from [149]. b AFM images of nanotubes grown using lithographically patterned catalyst and Co nanoparticles with a diameter of ∼ 1.7 nm. Adapted from [150]