镍基少层石墨烯电极场发射性能机制与微结构分析

doi:10.11896/cldb.22040305

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Abstract Graphene has been widely used in the field of industrial technology because of its excellent properties. The adsorption of alkali metal atoms by graphene will greatly reduce the surface work function, and its application in the electrode material of thermoelectric devices can significantly improve the output performance of devices. The results show that the cesium vapor forms a stable structure on the surface of nickel-substrate graphene in the form of cesium atoms by using the ‘yo-yo’ method of alternating activation of cesium and oxygen. The photocurrent increases gradually, and the work function on the surface of graphene decreases. The oxygen atom interacts with the cesium atom adsorbed on the surface. Under the action of the oxygen atom, the cesium atom is ionized, and the photocurrent increases rapidly, further reducing the work function on the surface of graphene. XPS and UPS analysis results showed that the minimum values of the surface work function of the bilayer graphene, trilayer graphene and penta layer graphene after cesium oxygen activation were 1.446 eV, 1.388 eV and 1.253 eV, respectively, which decreased by 56.38%, 58.55% and 62.58% compared with that before activation. The decreased degree of the work function is related to the number of graphene layers. The increase of the number of graphene layers promotes the generation of the Cs-O-Cs dipole structure, and Cs₂O and CsC₈ have a synergistic effect on the decrease of the work function. In addition, the Cs-O-C dipole strengthens the effect of the C-Cs dipole on the longitudinal electric field of the surface, and explains the mechanism of the decrease of the work function of graphene after cesium deposition.

Key words： cesium oxygen activation photocurrent dipole structure adsorption work function

Published: 25 June 2023 Online: 2023-06-20

CLC number:

TM915

Fund:National Natural Science Foundation of China (2180051117) and the National Magnetic Confinement Fusion Program of China (2018YFE0312200).

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	SONG Xiaoyong
	FANG Shuoyang
	ZHAO Ming
	SUN Lujun
	JIANG Zhizhong

Cite this article:

SONG Xiaoyong,FANG Shuoyang,ZHAO Ming, et al. Field Emission Performance Mechanism and Microdomain Analysis of Nickel-based Few-layer Graphene Electrodes[J]. Materials Reports, 2023, 37(12): 22040305-6.

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http://www.mater-rep.com/EN/10.11896/cldb.22040305 OR http://www.mater-rep.com/EN/Y2023/V37/I12/22040305

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