A Graphene-Coated Mo Tip Array for Highly-Efficient Nanostructured Electron Field Emitters.

Ningli Zhu,Yunsong Di,Jing Chen,Hai Deng

doi:10.3390/mi9010012

Ningli Zhu, Yunsong Di + Show 2 more

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An efficient electron field emitter based on a monolayer graphene coated well aligned Mo tip array has been designed, fabricated, and evaluated. The advantages of this hybrid nanostructure film morphology are explored and discussed. Efficient and stable field emissions with low turn-on fields have been observed with the new devices. It is further found that the combination of graphene and Mo tip array leads to significant improvements in efficiency for the nanoscale heterostructure emitters.

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Electron field emission is a quantum tunneling phenomenon whereby electrons are emitted from a solid surface which is affected by a strong electric field [1]
The materials used for cold cathode emitter must exhibit field enhancing effects internally or externally [7]. Nanostructured materials such as carbon nanotubes [8,9], carbon nanosheets [10,11], graphene [12,13], graphene oxide (GO) [14,15], and sharp nanotips [16,17], are capable to function as more efficient field emitters than traditional emission materials
Through device parameter optimizations, we investigated the field electron characteristics of graphene-coated Mo tip array that can be used to fabricate an emerging class of highly emission characteristics of graphene-coated Mo tip array that can be used to fabricate an emerging efficient nanostructured field emitters

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Introduction

Electron field emission is a quantum tunneling phenomenon whereby electrons are emitted from a solid surface which is affected by a strong electric field [1]. The materials used for cold cathode emitter must exhibit field enhancing effects internally or externally [7]. Nanostructured materials such as carbon nanotubes [8,9], carbon nanosheets [10,11], graphene [12,13], graphene oxide (GO) [14,15], and sharp nanotips [16,17], are capable to function as more efficient field emitters than traditional emission materials. Planar surfaces with low enhancement factors, contingent on the emitter’s material properties, may need a high turn-on fields of up to 1000 V/μm [19]. High electric fields are undesirable as they can result in deleterious electrical discharge and vacuum breakdown [20]

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