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

Abstract

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.

Highly Stable Field Emission from a Tungsten Diselenide Monolayer on Zinc Oxide Nanowire by Geometrically Modulating Hot Electrons

“…Studies have been reported on field emission from 2D materials such as graphene, graphene oxide, MoS 2 , MoSe 2 , WS 2 , and SnS 2 . While most of the early research suggested that the edge structure of 2D materials was more beneficial for field emission owing to its ultrahigh field enhancement factor, recent work has proposed using its surface as a field emitter with a hybrid structure consisting of 2D layered material supported on 1D nanowire (nanotip) . Geometrical modulation of the 2D material by the supporting nanowire has achieved enhanced field emission and high stability with 2D–1D hybrid structure.…”

Intensity Switchable and Wide-Angle Mid-Infrared Perfect Absorber with Lithography-Free Phase-Change Film of Ge2Sb2Te5

“…The optical properties of GST, specifically its permittivity, vary considerably between amorphous and crystalline phases. Consequently, GST can readily be harnessed and resonantly enhanced in a nanostructure to realize specific switching characteristics [25,26,27]. Moreover, MM- and MS-based absorbers often require rather complex, time-consuming nanofabrication steps, and expensive technical equipment, which limit their practical applications.…”