Secondary electron emission characteristics of graphene films with copper substrate

Jie Wang; Yong Wang; Yanhui Xu; Yuxin Zhang; Bo Zhang; Wei Wei

doi:10.1088/1674-1137/40/11/117003

Chinese Physics C> 2016, Vol. 40> Issue(11) : 117003 DOI: 10.1088/1674-1137/40/11/117003

Secondary electron emission characteristics of graphene films with copper substrate

1.
National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

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Abstract：
For modern and future circular accelerators, especially high-intensity proton synchrotrons or colliders, the electron cloud effect is a key issue. So, in order to reduce the electron cloud effect, exploring very low secondary electron yield (SEY) material or coating used in vacuum tubes becomes necessary. In this article, we studied the SEY characteristics of graphene films with different thicknesses which were deposited on copper substrates using chemical vapor deposition. The SEY tests were done at temperatures of 25℃ and vacuum pressure of (2-6)×10^-9 torr. The properties of the deposited graphene films were investigated by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The SEY curves show that the number of graphene layers has a great effect on the SEY of graphene films. The maximum SEY of graphene films decreases with the increase of the number of layers. The maximum SEY of 6-8 layers of graphene film is 1.25. These results have a great significance for next-generation particle accelerators.
- secondary electron yield ,
- graphene films ,
- low SEY film

References

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Jie Wang, Yong Wang, Yanhui Xu, Yuxin Zhang, Bo Zhang and Wei Wei. Secondary electron emission characteristics of graphene films with copper substrate[J]. Chinese Physics C, 2016, 40(11): 117003. doi: 10.1088/1674-1137/40/11/117003

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Received: 2016-03-17
Revised: 2016-07-10

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Supported by the National Natural Science Foundation of China (11475166) National Natural Science Foundation of China (11205155) and National Natural Science Foundation of China (11575214)

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

Secondary electron emission characteristics of graphene films with copper substrate

Corresponding author: Yong Wang,

Corresponding author: Bo Zhang,

1. National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China

Received Date: 2016-03-17

Accepted Date: 2016-07-10

Available Online: 2016-11-05

Fund Project: Supported by the National Natural Science Foundation of China (11475166) National Natural Science Foundation of China (11205155) and National Natural Science Foundation of China (11575214)

Abstract: For modern and future circular accelerators, especially high-intensity proton synchrotrons or colliders, the electron cloud effect is a key issue. So, in order to reduce the electron cloud effect, exploring very low secondary electron yield (SEY) material or coating used in vacuum tubes becomes necessary. In this article, we studied the SEY characteristics of graphene films with different thicknesses which were deposited on copper substrates using chemical vapor deposition. The SEY tests were done at temperatures of 25℃ and vacuum pressure of (2-6)×10^-9 torr. The properties of the deposited graphene films were investigated by X-ray photoelectron spectroscopy (XPS) and Raman spectroscopy. The SEY curves show that the number of graphene layers has a great effect on the SEY of graphene films. The maximum SEY of graphene films decreases with the increase of the number of layers. The maximum SEY of 6-8 layers of graphene film is 1.25. These results have a great significance for next-generation particle accelerators.

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Secondary electron emission characteristics of graphene films with copper substrate

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