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(a) A SEM overview image of an as grown CNT pillar array. (b) Magnified image of an as grown CNT pillar. (c) SEM micrograph of a plasma treated CNT pillar array. Plasma treatment changes the shape of the pillar into a cone. (d) Magnified overview of a conical shape CNT bunch.
The Raman spectra of an as grown and CNT pillar array after plasma treatment.
Field emission current density vs electric field for a vertically aligned CNT pillar array (a) before and (b) after plasma treatment. The inset is the corresponding FN plots.
Summary of Raman spectra for an as grown and CNT pillar array after plasma treatment.
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