Carbon nanotube growth for field-emission cathodes from graphite paste using Ar-ion bombardment

Hunt, Charles E.; Glembocki, Orest J.; Wang, Yu; Prokes, Sharka M.
April 2005
Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p163112
Academic Journal
Multiwall carbon nanotubes (MW-CNT) have been synthesized from solid-phase graphite. The graphite is deposited as a thick-film paste and irradiated with a 1.2 keV flood Ar-ion beam, transforming the graphite surface to a composite of MW-CNT embedded in the graphite matrix. Micro-Raman measurements have verified that the nanotubes are metallic in nature. The technique was used to make printed field-emission cathodes. Emission from these cathodes demonstrates Fowler–Nordheim tunneling characteristics. The irradiated film emits at an extraction field of 5.0 V/μm, which is less than one-sixth of the minimum extraction field of the nonirradiated graphite film, and exhibit lower noise and greater emission uniformity.


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