Thermal-Assisted Field Emission Characteristics of Carbon Nanotubes and Application in Pulsed X-Ray Imaging
Zhiqiang Xia, Shichao Feng, Xiaodong Sun, Chi Li, Zhenjun Li, Liye Zhao
TL;DR
This paper explores how carbon nanotubes can be used for stable and efficient pulsed X-ray imaging by improving their electron emission performance.
Contribution
The study introduces a thermal-assisted field emission mode for carbon nanotubes that enhances emission stability and enables high-speed X-ray imaging.
Findings
Thermal-assisted operation reduced current fluctuations in carbon nanotube emission to below 1%.
CNT cathodes achieved microsecond-scale pulse response and lower power consumption compared to traditional cathodes.
Pulsed X-ray imaging at 100 μs intervals clearly visualized rotating blades at 600 Hz.
Abstract
Carbon nanotube (CNT) cathode materials exhibit excellent electron emission performance and have become a key research focus in the field of vacuum electronics. However, their practical applications are still restricted by challenges, including emission instability and ambiguity in temporal resolution capability. This work investigated the thermal-assisted field emission characteristics of CNT and their application in pulsed X-ray imaging. Systematic characterization of the turn-on field strength, emission stability, pulse response characteristics, and pulsed X-ray imaging performance demonstrated that the thermal-assisted operating mode reduced current fluctuations to below 1%. Increasing the heating power further enhanced emission stability and lowered the turn-on field strength. In thermal-assisted pulsed emission mode, CNT cathodes exhibited reduced power consumption compared to…
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Taxonomy
TopicsCarbon Nanotubes in Composites · Diamond and Carbon-based Materials Research · Advanced Electron Microscopy Techniques and Applications