研究目的
Exploring the field emission performance of graphene paper and its potential application in low-power X-ray sources.
研究成果
Graphene paper exhibits competitive FE characteristics and is a promising material for low-power X-ray sources, despite its degradation under high emission currents.
研究不足
The emitter becomes thermally unstable at current levels around 100 μA, leading to degradation and evaporation.
1:Experimental Design and Method Selection:
The study involved shaping graphene paper into a triangular form to explore its field emission characteristics.
2:Sample Selection and Data Sources:
Graphene paper was prepared by chemically exfoliating graphene crystallites from graphite powder.
3:List of Experimental Equipment and Materials:
Equipment included a vacuum system, SEM for analysis, and an Amptek XR-100 SDD X-ray detector. Materials included graphene paper and a Ni foil target.
4:Experimental Procedures and Operational Workflow:
FE measurements were performed in diode or triode configurations under different vacuum pressures.
5:Data Analysis Methods:
Electron spectra were analyzed according to the Fowler-Nordheim-theory to estimate work function and emitter temperature.
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