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Quantifying temperature-enhanced electron field emission from individual carbon nanotubes

Martin Sveningsson (Institutionen för teknisk fysik) ; Klavs Hansen ; Krister Svensson (Institutionen för teknisk fysik, Fasta tillståndets fysik) ; Eva Olsson (Institutionen för teknisk fysik, Mikroskopi och mikroanalys) ; Eleanor E.B. Campbell
Physical Review B Vol. 72 (2005), p. 085429.
[Artikel, refereegranskad vetenskaplig]

The electron field emission properties of individual multiwalled carbon nanotubes have been examined using a combined STM-TEM microscope. The measured electron emission, for low emission currents, can be fitted with a standard Fowler-Nordheim model. For higher electron emission, above 10 µA for an individual carbon nanotube, we observe a significantly increased emission current leading to a nonlinear Fowler-Nordheim plot. The nonlinearity is caused by thermally enhanced electron emission due to Ohmic heating of the carbon nanotube. This is verified by modeling the electron field emission current. In addition to the influence of radiative cooling and the temperature dependence of the nanotube resistivity, we clearly show that a consideration of the temperature change due to the electron emission process itself, known as the Nottingham effect, is crucial to obtain good agreement with the experimental data.

Denna post skapades 2006-08-28. Senast ändrad 2014-11-27.
CPL Pubid: 8899


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Institutioner (Chalmers)

Institutionen för teknisk fysik (1900-2015)
Institutionen för fysik (GU) (GU)
Institutionen för teknisk fysik, Fasta tillståndets fysik (2005-2015)
Institutionen för teknisk fysik, Mikroskopi och mikroanalys (2005-2012)



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