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Thermionic field electron emission from graphite‐based nanomaterials
Author(s) -
Lyashenko S.,
Kleshch V.,
Obraztsov A.
Publication year - 2011
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201100075
Subject(s) - thermionic emission , work function , field electron emission , cathode , graphite , electron , work (physics) , materials science , field (mathematics) , nanomaterials , chemical vapor deposition , current density , carbon fibers , condensed matter physics , atomic physics , nanotechnology , thermodynamics , chemistry , physics , nuclear physics , composite material , mathematics , layer (electronics) , quantum mechanics , pure mathematics , composite number
Thermionic and field electron emissions governed by Richardson–Dushman and Fowler–Nordheim equations, respectively, normally coexist under typical experimental conditions. However, some carbon‐based cathodes demonstrate deviations of temperature dependencies of the current–voltage characteristics from those predicted by these equations. The nature of deviations cannot be ascribed to insufficient variations of work function or surface topology, which result from temperature variations. In this work, the temperature dependencies of the electron emission characteristics were experimentally investigated for the nanographite film cathodes obtained by a chemical vapor deposition method. It was found that self‐consistent explanation of the experimental observations of the thermionic and field electron emissions from the nanocarbon cathodes may be given by taking into account the temperature dependence of free carrier density.