Dense, well-separated, and aligned carbon nanotubes have been prepared via bias-enhanced microwave plasma chemical vapor deposition. The turn-on fields defined at the emission current density of 10 μA/cm2 are about 3.35 V/μm, 2.54 V/μm, and 3.54 V/μm, for the immersion times in PdCl2 of 1 min, 20 min, and 40 min, respectively. The corresponding emission current densities are about 0.97 mA/cm2, 4.5 mA/cm2, and 0.44 mA/cm2 at the electric field of 5 V/μm. The higher emission current obtained from the aligned carbon nanotubes for the immersion time of 20 min is ascribed to the denser and sharper nanotubes formed in this condition.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Issue number||9 A/B|
|State||Published - 15 Sep 2000|