Abstract
Graphene sheet with high enhancement factor and low emission field were exfoliated from carbon fibers in carbon cloth. It was a new concept that kept the graphene sheets stay on the carbon fiber and were used, in situ, as emitters. Due to their high multistage enhancement factor and intrinsic low contact resistance, electron emission from these graphene required a low emission field. The threshold-field corresponding to emission current density of 1mA/cm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> was about 0.7V/μm. This high enhancement factor was attributed to the effects of the high aspect ratio of graphene sheets and the geometry of carbon cloth.
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