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(a) Schematic drawing of field emission testing system. (b) SEM image of TCCs grown on the Au wire.
TEM images (a) and (b), EDX spectra (c), and the electron diffraction pattern recorded from Pt  zone axis (d) of a single tubular carbon cone.
Field emission measurements of TCCs: (a) Typical curve with an inset FN plot and (b) stability of field emission as a function of time at fixed electric field of .
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