Scopul nostru este sprijinirea şi promovarea cercetării ştiinţifice şi facilitarea comunicării între cercetătorii români din întreaga lume.
Autori: V. Filip, D. Nicolaescu, M. Tanemura, and F. Okuyama
Editorial: Elsevier Science B. V., Ultramicroscopy, 89, p.39-49, 2001.
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