Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2007, Vol. 18 ›› Issue (5): 276 doi: 10.1016/S1001-8042(07)60061-X

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Enhanced field emission from nano-graphite coated carbon nanotubes

LI Qintao1,2 NI Zhichun1,2 GONG Jinlong1,* ZHU Dezhang1 ZHU Zhiyuan1   

  1. 1 Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China;
    2 Graduate School of the Chinese Academy of Sciences, Beijing 100049, China
LI Qintao NI Zhichun GONG Jinlong ZHU Dezhang ZHU Zhiyuan. Enhanced field emission from nano-graphite coated carbon nanotubes.Nuclear Science and Techniques, 2007, 18(5): 276     doi: 10.1016/S1001-8042(07)60061-X
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Abstract: An effective method by low energy carbonhydrogen ion treatment to enhance field emission of the carbon nanotubes (CNTs) is demonstrated. Comparing with control, field emission (FE) currents of the CNTs by carbonhy-drogen ion irradiation increased, and the turn-on field and the threshold field decreased significantly. The structure characteristic revealed by transmission electron microscopy demonstrates that CNTs are coated by nano-graphite par-ticles after being treated with low energy carbonhydrogen ion and that there are large quantities of defects and grain boundaries in the coated layer. It is considered that the coating layer can decrease the effective surface work function of CNTs and correspondingly increase field emission. In addition, the defects, the grain boundaries and the C-H di-poles forming in the process of the low energy ions irradiation can effectively enhance the field emission.

Key words: Graphite, Carbon nanotubes, Ion beam deposition, Field emission