研究目的
Investigating the field emission properties of a unique porous sponge-like structured graphene as a field emission emitter.
研究成果
The study demonstrates that porous sponge-like graphene (SLG) can serve as an effective field emission emitter with a relatively low turn-on field due to its unique structure. The field enhancement factor of SLG was calculated to be significantly high, indicating its potential for field emission applications. However, optimization of the hole density is suggested to improve emission current density.
研究不足
The emission current density of the SLG samples seems relatively lower, which may correspond to the low emission site density. The hole density of such porous SLG should be optimized.
1：Experimental Design and Method Selection:
The study involves the synthesis of sponge-like graphene (SLG) using chemical vapor deposition (CVD) and its characterization for field emission properties.
2：Sample Selection and Data Sources:
Sponge nickel with specific surface density and thickness was used as the attached material in the preparation of graphene.
3：List of Experimental Equipment and Materials:
CVD furnace quartz tube, hydrochloric acid solution, acetone, absolute ethyl alcohol, deionized water, and a vacuum chamber with a diode configuration for field emission tests.
4：Experimental Procedures and Operational Workflow:
The process includes cleaning the sponge nickel, CVD growth of graphene, mechanical polishing, etching of nickel substrate, and field emission testing.
5：Data Analysis Methods:
Field emission properties were analyzed using Fowler-Nordheim (FN) theory to calculate the field enhancement factor.
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