The influence of temperature and electric field on field emission energy distribution of an individual single-wall carbon nanotube

Ping Wu; Huang, N. Y.; Deng, S. Z.; Liang, S. D.; Jun Chen; Xu, N. S.
June 2009
Applied Physics Letters;6/29/2009, Vol. 94 Issue 26, p263105
Academic Journal
The influence of temperature and electric field on field emission energy distribution (FEED) is studied. It is found that higher temperature energizes more higher-energy electrons. FEED peaks shift toward low energy linearly with the increase in applied voltage because of the electric field penetration. The theoretic current-voltage characteristic is fitted to the experimental data by the density of states, field enhancement factor, and temperature, from which the average energy of emitted electrons and then Fermi level of the carbon nanotube (CNT) is ascertained. This research confirms that the electric field competes with temperature and provides a method to ascertain the Fermi level of CNT.


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