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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
Published on: September 23, 2018
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Ultra-thin freestanding graphene films for efficient thermal insulation and electromagnetic interference shielding
Peng Zhang1,2, Zhi Cao1, Chunle Liu3
1College of Bioresources Chemical and Materials Engineering, Shaanxi University of Science & Technology Wei Yang District Xi'an 710021 Shaanxi China luoxiaomin@sust.edu.cn fengjianyan@sust.edu.cn.
RSC Advances
|June 29, 2023
Summary
This study optimized electrochemical exfoliation for high-yield graphene films. Microwave reduction further enhanced conductivity and electromagnetic shielding, offering promising applications.
Area of Science:
- Materials Science
- Nanotechnology
- Electrochemistry
Background:
- Freestanding graphene films are crucial for industrial applications.
- Developing convenient and eco-friendly preparation methods remains a key challenge.
- Electrochemical exfoliation is a promising technique for graphene production.
Purpose of the Study:
- To systematically explore factors influencing high-performance graphene preparation via electrochemical exfoliation.
- To optimize post-processing of graphene films using microwave reduction.
- To evaluate the performance of the resulting freestanding graphene films.
Main Methods:
- Electrochemical exfoliation using ammonium sulfate electrolyte (0.2 M, pH 11, 8 V) to produce graphene.
- Microwave reduction under volume-limited conditions for post-processing.
- Evaluation of electrical conductivity, yield, defectivity, and electromagnetic shielding performance.
Main Results:
- Optimal conditions identified for low-oxidation graphene preparation with 65% yield and 1.6 Ω sq-1 square resistance.
- Microwave post-processing significantly improved electrical conductivity and joule heating.
- Achieved excellent electromagnetic shielding performance (53 dB) and low thermal conductivity (0.05 W m-1 K-1).
Conclusions:
- The optimized electrochemical exfoliation and microwave reduction strategy yields high-performance freestanding graphene films.
- Enhanced conductivity and unique interlayer structures contribute to superior electromagnetic shielding.
- This eco-friendly method shows significant potential for applications in flexible electronics and electromagnetic wave protection.
