Study of the Effective Field Emitting Angle for an Individual Carbon Nanotube

다국어 초록 (Multilingual Abstract)

In this work, the effective field emitting angle θeff is introduced for a carbon nanotube (CNT)to relate the spatial variation of the current density along the tip’s surface to the emission current.
The emission current can now be calculated by using I = 2π(1-cosθeff )r2J(0), where J(0) is theemission current density at the apex and r is the radius of curvature of the tips. Analytical resultsshow that θeff depends on the macroscopic field E0, the aspect ratio h/r and the normalized fielddistribution on the tip’s surface E(θ)/E(0). Simulation results show that E(θ)/E(0) converges withincreasing h/r and can be fitted by using a formula when h/r > 500. Finally, a fit function for θeff is obtained for h/r > 500 and E0 in the range of 1 - 25 V/µm.

참고문헌 (Reference)

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