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Modeling the electron field emission from carbon nanotube films

Domenii publicaţii > Fizica + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: V. Filip, D. Nicolaescu, M. Tanemura, and F. Okuyama

Editorial: Elsevier Science B. V., Ultramicroscopy, 89, p.39-49, 2001.

Rezumat:

A theoretical framework for the electron field emission from carbon nanotubes (CNTs)is discussed. Using the tunneling theory, the influence of the detailed electron energy dispersion is proven to be oflittle importance for the electron field emission. By means ofnumerical computations in a simplified model, the influence of the environment on the local field on a CNT is discussed for an aligned CNT film. In a simple triangular model for the potential energy barrier at the tube end, a tunneling probability was obtained. A statistical model was developed for the structural and functional parameters of aligned CNT films. Practical CNT films of excellent alignment, obtained directly on a tungsten wire by plasma-enhanced chemical vapor deposition, were analyzed by this statistical model. Their distribution in the enhancement factors was thus deduced. An indirect method to get the average electrical parameters of the film using only a limited amount of experimental data was thus established.

Cuvinte cheie: Electron field emission, Carbon nanotubes, Electrostatic screening