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Characteristics of carbon‐fibre cold field emission tips with a dielectric coating
Author(s) -
Mousa M. S.,
Kelly T. F.
Publication year - 2004
Publication title -
surface and interface analysis
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.52
H-Index - 90
eISSN - 1096-9918
pISSN - 0142-2421
DOI - 10.1002/sia.1901
Subject(s) - field electron emission , coating , tungsten , materials science , carbon fibers , drop (telecommunication) , dielectric , composite material , analytical chemistry (journal) , electron , chemistry , optoelectronics , metallurgy , telecommunications , physics , chromatography , quantum mechanics , composite number , computer science
Field electron emitters have been prepared by coating a carbon fibre with an epoxylite resin, and their properties investigated. The emission stability is improved compared with an uncoated fibre. An optimum coating thickness of 0.2–0.3 µm has been found. Energy spectra have been measured and peak shifts of up to 1 eV as a function of emission current have been observed. Surprisingly, these peaks shifts are comparable with those found for uncoated carbon fibres and for resin‐coated tungsten emitters. Their origin is not clear, but it seems that resistive drop cannot be the whole explanation. We speculate that these peak shifts may be related to the dynamics of surface‐state occupation at the material/vacuum interface. Copyright © 2004 John Wiley & Sons, Ltd.