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Topic: Power and Propulsion Technology for Deep Space
Research on Long Life Carbon Nanotube Cathodes for Deep Space Exploration Missions
- CHEN Zexuan, XIAO Dongyang, DU Huanhuan, SONG Peiyi
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Precision Gravitational Measurement Facility,School of Physics,Huazhong University of Science and Technology,Wuhan 430074,China
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Received |
Revised |
Published |
31 Oct 2023 |
30 Dec 2023 |
27 Jun 2024 |
Issue Date |
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27 Jun 2024 |
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Abstract
To meet the demand for long-life carbon nanotube field emission cathode in deep space exploration,the failure mechanism of CNTs cathode was investigated,and a long-life CNTs cathode design was introduced. Patterning the CNTs as an array of CNTs island offers a way to eliminate the shielding effects of electrical field. In this way the areas of emitting CNTs are larger,which avoids over-heating on a small emission area. A bonding technique was introduced,the contact between CNTs and substrate was maintained by molecular forces previously,melting metal was introduced as the bonding layer. The mechanical robustness of the CNTs cathode was enhanced while the electrical/thermal resistance was reduced. Performance tests were conducted on the prototype in a high vacuum environment. The prototype produced a current of 0–1 mA with a resolution less than 2 μA and the noise level was less than 1 μA/Hz1/2@0.01–1 Hz. The prototype was tested by over 550 hours' continuous emitting,showing good stability in long-term use.
Keywords
carbon nanotube /
field emission cathode /
array design /
edge effects /
transfer-bonding technique
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CHEN Zexuan, XIAO Dongyang, DU Huanhuan, SONG Peiyi.
Research on Long Life Carbon Nanotube Cathodes for Deep Space Exploration Missions. Journal of Deep Space Exploration, 2024, 11(2): 124‒131 https://doi.org/10.15982/j.issn.2096-9287.2024.20230152
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