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A good quality graphene is transferred onto honeycomb-like CNTs arrays with inner supporting CNTs. The efficient field emission is demonstrated due to a high aspect ratio protrusions and graphene crack edges. A high efficient current density about 1.2 mA/cm2 at threshold electric field of 7.8 V/μm with a turn-on electric field of 1.8 V/μm at the current density of 10 μA/cm2 is observed due to high...
In this paper, we use graphene as conductive layer to improve the field emission properties of CNTs. The metallic nature of graphene and its low contact resistance with metal electrode give a small voltage drop both along the graphene and at the graphene/metal interface. This means that the supply of electrons from the electrode to the emitters is sufficient.
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