Field enhanced thermionic emission from oxide coated carbon nanotubes

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dc.contributor.advisor Jin, Feng en_US Day, Christopher M. en_US 2011-06-03T19:40:57Z 2011-06-03T19:40:57Z 2006 en_US 2006
dc.identifier LD2489.Z78 2006 .D39 en_US
dc.description.abstract A cathode structure was demonstrated that utilizes aligned carbon nanotubes (CNTs) to improve the thermionic electron emission by increasing the field enhancement of the cathode surface. Aligned CNTs were grown on the surface of a tungsten substrate by plasma enhanced chemical vapor deposition. The tungsten-CNT structure was further coated with a thin film of low work function emissive materials by magnetron sputtering. Numerous cathodes with varying CNT morphology and oxide layer thickness were created. The field and thermionic emission of the cathodes were tested in order to study the effects of the surface properties on the emission characteristics. It was observed that the introduction of CNTs into an oxide cathode structure improves both the thermionic and field emission, even in cathodes with relatively low field enhancement factors. Because of the high field enhancement factors that are available for CNTs, there remains a potential for dramatically improved electron emission. en_US
dc.description.sponsorship Department of Physics and Astronomy en_US
dc.format.extent vii, 143 leaves : ill. ; 28 cm. en_US
dc.source Virtual Press en_US
dc.subject.lcsh Electron tubes -- Thermionic emission. en_US
dc.subject.lcsh Field emission. en_US
dc.subject.lcsh Carbon nanotubes. en_US
dc.subject.lcsh Oxide coating. en_US
dc.title Field enhanced thermionic emission from oxide coated carbon nanotubes en_US Thesis (M.S.) en_US
dc.identifier.cardcat-url en_US

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  • Master's Theses [5318]
    Master's theses submitted to the Graduate School by Ball State University master's degree candidates in partial fulfillment of degree requirements.

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