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首页> 外文期刊>Journal of Vacuum Science & Technology. B, Microelectronics and Nanometer Structures >Ring-shaped images as a result of nonuniform field emission from capped carbon nanotubes
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Ring-shaped images as a result of nonuniform field emission from capped carbon nanotubes

机译：封端的碳纳米管非均匀场发射导致的环形图像

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摘要

A model for electron field emission from carbon nanotubes (CNTs) has been developed and modeling results are presented. The model assumes that for high emission currents, part of the electrons behave as quasifree. As a result, the spatial confinement quantization of their states appears, the tunneling field emission taking place from these states into the vacuum. The probability of finding an electron in a small axial interval is higher close to the CNT cylindrical body, while the extraction field is higher on the CNT hemispherical tip. These two opposite trends lead to enhancement of the CNT lateral field emission for higher extraction voltages. The model outlines the possibility of inhomogeneous electron field emission for very thin CNTs at high emission levels and the appearance of peculiar ring-shaped and/or spot-shaped field emission images, in accordance to available experimental observations.
机译：建立了碳纳米管（CNTs）发射电子场的模型，并给出了建模结果。该模型假设对于高发射电流，部分电子表现为准自由。结果，出现了它们状态的空间限制量化，隧道场发射从这些状态发生到真空中。在较小的轴向间隔中找到电子的可能性在CNT圆柱体附近较高，而在CNT半球形尖端上的提取场较高。对于较高的提取电压，这两个相反的趋势导致CNT横向场发射的增强。该模型概述了根据可获得的实验观察结果，在高发射水平下，非常薄的CNT产生不均匀电子场发射的可能性，以及奇特的环形和/或点状场发射图像的出现。

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