Figure 3.

Line patterns of CNTs by varying the catalytic nanoparticle deposition time. (a) SEM image of the Fe nanoparticle pattern before the CVD process. The catalyst deposition time is 60 min, and the pattern width is about 30 μm. (b) to (d) SEM images showing CNTs synthesized for different catalytic nanoparticle deposition times: (b) 5, (c) 10, and (d) 40 min. The pattern width is about 30 μm. At least 10 min of catalyst deposition was needed to grow dense CNTs. Insets in (a) to (d) are at high magnification, and the scale bars are 2 μm.

Na et al. Nanoscale Research Letters 2013 8:409   doi:10.1186/1556-276X-8-409
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