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)
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
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.
Received: 25 October 2005
Revised: 25 September 2006
Accepted manuscript online:
PACS:
79.70.+q
(Field emission, ionization, evaporation, and desorption)
(Surface double layers, Schottky barriers, and work functions)
Fund: Project supported by the Science and
Technology Foundation of Education Ministry of China (Grant No 205091).
Cite this article:
Lu Zhan-Ling(鲁占灵), Wang Chang-Qing(王昶清), Jia Yu(贾瑜), Zhang Bing-Lin(张兵临), and Yao Ning(姚宁) Electron emission degradation of nano-structured sp2-bonded amorphous carbon films 2007 Chinese Physics 16 843
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