研究目的
Investigating the structure stability of graphene field emitter under high dose electron beam illumination and high current field emission.
研究成果
Graphene would become amorphous under a high dose high energy electron bombardment. Graphene would also become porous during field emission due to the Joule heating effect. The field emission characteristics of graphene was strongly influenced during the interaction with high energy and high dose electron.
研究不足
The study focuses on the structure evolution of graphene under specific conditions of electron beam illumination and field emission, which may not cover all possible operational conditions of graphene field emitters.
1：Experimental Design and Method Selection
An in-situ system transmission electron microscope (TEM) combined with a field emission nano-probe was adopted to observe the structure and morphology evolution of graphene during high current field emission in nano scale.
2：Sample Selection and Data Sources
A CVD-grown graphene sheet was transferred on a semi-TEM grid by using a PMMA assisted wet transfer method.
3：List of Experimental Equipment and Materials
TEM holder, tungsten tip, graphene sheet, PMMA.
4：Experimental Procedures and Operational Workflow
The anode tip was moved to get close to the graphene sheet. A voltage (0-140 V) was applied on the anode and created an electric field on the gap between graphene and anode where the field emission happens. The structure and morphology change of graphene was observed in HRTEM in the mean time.
5：Data Analysis Methods
The structure of graphene was imaged before and after electron illumination. The field emission characteristics of graphene before and after electron illumination was measured using the in-situ field emission probe.
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