Special Issue "Field Emission from Graphene and other Nanostructures"
Deadline for manuscript submissions: closed (31 December 2018) | Viewed by 31313
Interests: optical and electrical properties of nanostructured materials such as carbon nanotubes, graphene, and 2D materials; van der Waals heterostructures and Schottky junctions; field-effect transistors; non-volatile memories; solar cells; photodetectors; field emission devices
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The extraction of electrons from a conducting material by an external electric field, known as field emission (FE), is an interesting quantum–mechanical phenomenon, which has many practical applications. High-current and long-lifetime electron sources based on FE, so-called cold-cathodes, have been exploited in high-power and microwave vacuum electronic devices, flat panel displays, scanning and transmission electron microscopy, electron-beam lithography, electric propulsion systems, etc.
Ideal field emitters have a high current at low extraction field for low voltage applications as well as robustness and thermal stability for steady and long-lifetime emission. The lowering of the threshold voltage for FE is achieved using materials with low-workfunction, as well as materials with very rough surface or terminated in sharp tips to benefit from the local field amplification. The field enhancement is due to the convergence of the electric field lines on the sharp features of the conducting surface. Hence, materials naturally shaped or artificially patterned to have protrusions with high aspect ratio (such as nanotubes and nanowires, graphene and other 2D materials, or nanoparticles and nanotips) are suitable for FE. Furthermore, robustness against high current flow requires materials with high electrical and thermal conductivity.
The availability in the past two decades of new nanostructured materials and improved nano-patterning techniques has considerably boosted the research in FE materials and devices. A variety of novel cold-cathodes based on new nanostructured or nanofabricated materials has been added to the traditional Spindt-type field emitters, based on microfabricated Mo tips, and to the Si microtips developed in the early 1970s. These new cold cathodes include carbon nanotubes, graphene, nanodiamonds, semiconducting or metallic nanoparticles and nanowires, nanocones, etc.
This Special Issue, “Field Emission from Graphene and other Nanostructures” of Applied Sciences includes both fundamental studies and applications. It aims at covering all recent experimental and theoretical work on electron field emission from carbon-based and other nanostructured materials.
Prof. Dr. Antonio Di Bartolomeo
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- Field emission (FE)
- Cold cathode
- Field enhancement
- Fowler-Nordheim tunneling
- Vacuum electronics
- FE displays
- FE x-ray generation
- FE electron microscopy
- FE electron beam lithography
- FE electric propulsion