1. Field-Emission Energy Distribution of Carbon Nanotube Film and Single Tube under High Current.
- Author
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Wang, Lizhou, Wu, Yiting, Jiang, Jun, Tang, Shuai, Ke, Yanlin, Zhang, Yu, and Deng, Shaozhi
- Subjects
- *
CARBON films , *CARBON nanotubes , *ELECTRON sources , *ELECTRON distribution , *TUBES , *ELECTRIC fields - Abstract
A narrow energy distribution is a prominent characteristic of field-emission cold cathodes. When applied in a vacuum electronic device, the cold cathode is fabricated over a large area and works under a high current and current density. It is interesting to see the energy distribution of the field emitter under such a working situation. In this work, the energy distribution spectra of a single carbon nanotube (CNT) and a CNT film were investigated across a range of currents, spanning from low to high. A consistent result indicated that, at low current emission, the CNT film (area: 0.585 mm2) exhibited a narrow electron energy distribution as small as 0.5 eV, similar to that of a single CNT, while the energy distribution broadened with increased current and voltage, accompanied by a peak position shift. The influencing factors related to the electric field, Joule heating, Coulomb interaction, and emission site over a large area were discussed to elucidate the underlying mechanism. The results provide guidance for the electron source application of nano-materials in cold cathode devices. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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