Enhanced Field Emission of WS₂ Nanotubes

Abstract

Results on electron field emission from free standing tungsten disulfide (WS2) nanotubes (NTs) are presented. Experiments show that the NTs protruding on top of microstructures are efficient cold emitters with turn-on fields as low as 1 V/μm and field enhancement of few thousands. Furthermore, the emission current shows remarkable stability over more than eighteen hours of continuous operation. Such performance and long-term stability of the WS2 cathodes is comparable to that reported for optimized carbon nanotube (CNTs) based emitters. Besides this, it is found that the WS2 cathodes prepared are less sensitive than CNTs in chemical reactive ambients. The high field enhancement and superior reliability achieved indicates a potential for vacuum nanoelectronics and flat panel display applications.

Electron Emission Devices for Energy‐Efficient Systems

“…In the last couple of decades, large number of new materials and composites have been studied to reveal their field emission performance including different metals, semiconductors, metal oxides, sulfides, carbides, nitrides, ferrites, perovskite solids, hexaborides, and so on. Apart from these materials, low‐dimensional materials are getting significant attention recently.…”

Recent Developments on Emerging Properties, Growth Approaches, and Advanced Applications of Metallic 2D Layered Vanadium Dichalcogenides

“…Thus it points toward the realization of progressive field emission properties. [ 142–148 ] Due to limited conductivity of the semiconducting field emitters, researchers have been trying to explore field emission properties of metallic materials and among them VX 2 ‐based materials have emerged as the ideal candidates. Metallic VS 2 nanosheets are reported to show good field emission performance with a turn on field required to draw an emission current density of 1 and 10 µA cm −2 is 4.00 and 5.01 V µm −1 , respectively ( Figure a–c).…”

Fowler–Nordheim Law Correlated with Improved Field Emission in Self‐Assembled NiCr2O4 Nanosheets

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