中国物理B ›› 2007, Vol. 16 ›› Issue (3): 843-847.doi: 10.1088/1009-1963/16/3/048

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Electron emission degradation of nano-structured sp2-bonded amorphous carbon films

王昶清1, 贾瑜1, 张兵临1, 姚宁1, 鲁占灵2   

  1. (1)Key Laboratory of Material Physics of Education Ministry of China,Department of Physics, Zhengzhou University, Zhengzhou 450052, China; (2)Key Laboratory of Material Physics of Education Ministry of China,Department of Physics, Zhengzhou University, Zhengzhou 450052, China;Department of Material Science and Engineering, Zhengzhou University,Zhengzhou 450052, China
  • 收稿日期:2005-10-25 修回日期:2006-09-25 出版日期:2007-03-20 发布日期:2007-03-20
  • 基金资助:
    Project supported by the Science and Technology Foundation of Education Ministry of China (Grant No 205091).

Electron emission degradation of nano-structured sp2-bonded amorphous carbon films

Lu Zhan-Ling(鲁占灵)a)b), Wang Chang-Qing(王昶清)a), Jia Yu(贾瑜)a), Zhang Bing-Lin(张兵临)a)†, and Yao Ning(姚宁)a)   

  1. a Key Laboratory of Material Physics of Education Ministry of China, Department of Physics, Zhengzhou University, Zhengzhou 450052, China; b Department of Material Science and Engineering, Zhengzhou University, Zhengzhou 450052, China
  • Received:2005-10-25 Revised:2006-09-25 Online:2007-03-20 Published:2007-03-20
  • Supported by:
    Project supported by the Science and Technology Foundation of Education Ministry of China (Grant No 205091).

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摘要： The initial field electron emission degradation behaviour of original nano-structured sp2-bonded amorphous carbon films has been observed, which can be attributed to the increase of the work function of the film in the field emission process analysed using a Fowler--Nordheim plot. The possible reason for the change of work function is suggested to be the desorption of hydrogen from the original hydrogen termination film surface due to field emission current-induced local heating.For the explanation of the emission degradation behaviour of the nano-structured sp2-bonded amorphous carbon film, a cluster model with a series of graphite (0001) basal surfaces has been presented, and the theoretical calculations have been performed to investigate work functions of graphite (0001) surfaces with different hydrogen atom and ion chemisorption sites by using first principles method based on density functional theory-local density approximation.

关键词: nano-structured sp2-bonded amorphous carbon film, field emission, work function

Abstract: The initial field electron emission degradation behaviour of original nano-structured sp2-bonded amorphous carbon films has been observed, which can be attributed to the increase of the work function of the film in the field emission process analysed using a Fowler--Nordheim plot. The possible reason for the change of work function is suggested to be the desorption of hydrogen from the original hydrogen termination film surface due to field emission current-induced local heating.For the explanation of the emission degradation behaviour of the nano-structured sp2-bonded amorphous carbon film, a cluster model with a series of graphite (0001) basal surfaces has been presented, and the theoretical calculations have been performed to investigate work functions of graphite (0001) surfaces with different hydrogen atom and ion chemisorption sites by using first principles method based on density functional theory-local density approximation.

Key words: nano-structured sp2-bonded amorphous carbon film, field emission, work function

中图分类号:  (Field emission, ionization, evaporation, and desorption)

  • 79.70.+q
68.43.Mn (Adsorption kinetics ?) 73.30.+y (Surface double layers, Schottky barriers, and work functions)