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Field emission from carbon nanotube systems: Material properties to device applications

Sreekanth, M and Ghosh, S and Srivastava, P (2022) Field emission from carbon nanotube systems: Material properties to device applications. [Book Chapter]

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Official URL: https://doi.org/10.1007/978-3-030-91346-5_61


Electron sources are indispensable for many scientifically and technologically important applications like electron microscopy, e-beam lithography, X-ray generators, microwave amplifiers, etc. There is a need to replace thermionic electron sources due to their high power consumption, lower emission currents, and less durability caused by long-term emitter heating. Among several nanostructures explored in pursuit of suitable field emitters, carbon nanotubes (CNTs) are one of the best field emitters till date due to their fascinating properties such as high aspect ratio, high electrical conductivity, good thermal and chemical stabilities, high mechanical strength, and functionalizability. Despite their outstanding field emission properties in terms of turn-on and threshold fields, local field enhancement factor, and electron emission currents, there are still certain drawbacks associated with CNT based field emitters like high contact resistance and poor adhesion between CNTs and bare substrates, relatively higher work function of their tips, nanotube tip damage caused by the ion bombardment, high electric field screening among adjacent CNT emitters on large area substrates and poor temporal stability. To overcome these drawbacks, several pre-/post-synthesis methods were developed such as various synthesis methods, the lithography-assisted deposition, the low work function material coating, an interlayer/buffer layer deposition between the catalytic layer and the substrate, structural modification of CNT films, etc. In this chapter, firstly the basics of electron emission and its types, the brief history of field emitters and CNT-based field emission systems were discussed. Next, the methods employed to enhance the field emission properties of CNTs were explored. Finally, some important CNT-based FE applications were mentioned.

Item Type: Book Chapter
Publication: Handbook of Carbon Nanotubes
Publisher: Springer International Publishing
Additional Information: The copyright for this article belongs to Springer International Publishing.
Keywords: Carbon nanotubes; Chemical vapor deposition; Contact resistance; Field emission; Lithography; Work function
Department/Centre: Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited: 15 Jun 2023 08:51
Last Modified: 15 Jun 2023 08:51
URI: https://eprints.iisc.ac.in/id/eprint/81998

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