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Multi-wall nitrogenated carbon nanotubes (N-CNTs) are modified by the chlorine–plasma treatment (N-CNTs:Cl) and hence studied their field emission characteristics. It is observed that the turn-on voltage of N-CNTs is decreased from ~1.0 V/µm to ~0.875 V/µm on chlorination. The current density is enhanced from 1.3 mA/cm 2 (N-CNTs) to ~15 mA/cm 2 (N-CNTs:Cl) at an electric field of 1...
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