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High-Compressive, Elastic, and Wearable Cellulose Nanofiber-Based Carbon Aerogels for Efficient Electromagnetic
Jiancheng Zhang1, Weijia Guo1, Shunyu Shen1
1College of Chemistry and Materials Engineering, Zhejiang A&F University, Hangzhou, Zhejiang 311300, PR China.
ACS Applied Materials & Interfaces
|March 21, 2024
Summary
This study introduces a flexible cellulose/graphene aerogel for electromagnetic interference (EMI) shielding. The material demonstrates excellent mechanical properties and high EMI shielding effectiveness, offering a promising solution for advanced applications.
Area of Science:
- Materials Science
- Nanotechnology
- Composite Materials
Background:
- Developing advanced electromagnetic interference (EMI) shielding materials is crucial for modern electronics.
- Carbon-based materials offer high EMI shielding efficiency but often suffer from brittleness.
- Existing materials lack the required mechanical robustness and multifunctionality for widespread application.
Purpose of the Study:
- To fabricate a multifunctional aerogel with enhanced mechanical properties and superior EMI shielding performance.
- To overcome the brittleness limitation of traditional carbon-based shielding materials.
- To explore the potential of cellulose nanofiber/reduced graphene oxide-glucose carbon aerogel for diverse applications.
Main Methods:
- Directional freeze-drying of cellulose nanofiber, reduced graphene oxide, and glucose mixture.
- Carbonization of the freeze-dried aerogel to form the C-CNFs/rGO-glu composite.
- Mechanical testing (compression-release cycles) and electromagnetic shielding effectiveness (SE) measurements.
Main Results:
- The fabricated aerogel exhibited excellent compression (88% height retention) and elasticity (90.9% stress retention) after 100 cycles at 70% strain.
- Achieved high EMI shielding effectiveness of 67.5 dB, primarily through an absorption-dominant mechanism (97.5% absorption loss).
- Demonstrated multifunctionality including subtle electrical signal detection, heat insulation, and infrared stealth.
Conclusions:
- The developed cellulose nanofiber/reduced graphene oxide-glucose carbon aerogel overcomes the brittleness of carbon materials, offering robust mechanical performance and excellent EMI shielding.
- The material's absorption-dominant shielding mechanism and multifunctionality position it as a promising candidate for advanced electronic and stealth applications.
- This work presents a viable strategy for designing high-performance, mechanically stable, and multifunctional EMI shielding materials.
