Physics – Condensed Matter – Materials Science
Scientific paper
2007-07-18
Phys. Rev. B 76, 195412 (2007)
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevB.76.195412
The simulation of field electron emission from arrays of micrometer-long open-ended (5, 5) carbon nanotubes is performed in the framework of quantum theory of many electrons. It is found that the applied external field is strongly screened when the spacing distance is shorter than the length of the carbon nanotubes. The optimal spacing distance is two to three times of the nanotube length, slightly depending on the applied external fields. The electric screening can be described by a factor that is a exponential function of the ratio of the spacing distance to the length of the carbon nanotubes. For a given length, the field enhancement factor decreases sharply as the screening factor larger than 0.05. The simulation implies that the thickness of the array should be larger than a value but it does not help the emission much by increasing the thickness a great deal.
Chen Guihua
Deng Shaozhi
He Chunshan
Li Zhibing
Peng Jie
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