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Field‐Emission Characteristics from Wide‐Bandgap Material‐Coated Carbon Nanotubes
Author(s) -
Yi W.K.,
Jeong T.W.,
Yu S.G.,
Heo J.N.,
Lee C.S.,
Lee J.H.,
Kim W.S.,
Yoo J.B.,
Kim J.M.
Publication year - 2002
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/1521-4095(20021016)14:20<1464::aid-adma1464>3.0.co;2-4
Subject(s) - materials science , field electron emission , carbon nanotube , common emitter , field (mathematics) , nanotechnology , carbon fibers , band gap , optoelectronics , composite material , electron , physics , mathematics , quantum mechanics , composite number , pure mathematics
Field‐emission currents from SiO 2 ‐ or MgO‐coated carbon nanotube (CNT) emitters are larger than for uncoated equivalents. Moreover the coated emitters exhibit lower turn‐on fields and it is shown that the MgO or SiO 2 films protect the CNT tips during field emission, which improves the lifetime stability of these emitters. The Figure shows an SEM image of a SiO 2 ‐coated CNT emitter.