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Enhanced field emission of vertically oriented carbon nanosheets synthesized by C₂H₂/H₂ plasma enhanced CVD
- Zhu, M.Y., Outlaw, R.A., Bagge-Hansen, M., Chen, H.J., Manos, D.M.
- Carbon 2011 v.49 no.7 pp. 2526-2531
- acetylene, carbon, electric field, feedstocks, methane, nanomaterials, radio waves, vapors
- Carbon nanosheets, free-standing, two-dimensional, carbon nanostructures with atomically thin edges, were synthesized by radio frequency plasma enhanced chemical vapor deposition. This work reports nanosheet growth using acetylene as a feedstock gas. The maximum acetylene nanosheet growth rate was found to be 16μm/h or ∼8 times that of previously reported methane nanosheets. The acetylene nanosheets have a smooth surface morphology, an ordered, vertical orientation, a uniform sheet height distribution and a graphitic structure containing some defects. In emission current density vs. applied electric field (J–E) field emission measurements, the acetylene nanosheets have a threshold field, for 10μA/cm² current density, of ∼3.0V/μm. In direct current emission mode, a stable continuous milliampere level emission current, corresponding to a current density up to 9.4mA/cm², was collected from acetylene nanosheet samples for more than 100h.