Field Emission from Multi-walled Carbon Nanotubes and its Application in Nanoelectromechanical Systems

Dissertation

Field Emission from Multi-walled Carbon Nanotubes and its Application in Nanoelectromechanical Systems

M. Sveningsson-2006-01-01-Chalmers Publication Library (Chalmers University of Technology)

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TL;DRAbstract

Films of aligned multi-walled carbon nanotubes (MWCNTs) are\ninteresting for applications such as cold emission cathodes in flat-panel display technology and in lighting elements. MWCNTs are, besides this, good candidates to be used in\nnanoelectromechanical systems (NEMS).\n\nFilms consisting of MWCNTs have been fabricated using two different methods, thermal chemical vapour deposition (TCVD) and plasma enhanced chemical vapour deposition (PECVD). The results from electron field emission measurements show that high electron emission currents lead to ohmic heating and induce irreversible changes in the MWCNT films. The heating is higher for TCVD films compared with PECVD films, and can be explained by the poorer quality MWCNTs produced by TCVD. Spectral measurements of the emitted light from the films show black-body radiation corresponding to temperatures ranging from 1500-2200 K for the TCVD films. These high temperatures lead to degradation and emitter failure and can be a problem f

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Films of aligned multi-walled carbon nanotubes (MWCNTs) are\ninteresting for applications such as cold emission cathodes in flat-panel display technology and in lighting elements. MWCNTs are, besides this, good candidates to be used in\nnanoelectromechanical systems (NEMS).\n\nFilms consisting of MWCNTs have been fabricated using two different methods, thermal chemical vapour deposition (TCVD) and plasma enhanced chemical vapour deposition (PECVD). The results from electron field emission measurements show that high electron emission currents lead to ohmic heating and induce irreversible changes in the MWCNT films. The heating is higher for TCVD films compared with PECVD films, and can be explained by the poorer quality MWCNTs produced by TCVD. Spectral measurements of the emitted light from the films show black-body radiation corresponding to temperatures ranging from 1500-2200 K for the TCVD films. These high temperatures lead to degradation and emitter failure and can be a problem f

Keywords

Field electron emissionMaterials scienceCarbon nanotubeNanoelectromechanical systemsPlasma-enhanced chemical vapor depositionOptoelectronicsNanotechnologyChemical vapor deposition

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