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Transparent multi-layer graphene/polyethylene terephthalate structures with excellent microwave absorption and
Zhengang Lu1, Limin Ma1, Jiubin Tan1
1Ultra-Precision Optical & Electronic Instrument Engineering Center, Harbin Institute of Technology, Harbin, 150001, P. R. China. jbtan@hit.edu.cn xmding@hit.edu.cn.
Nanoscale
|October 8, 2016
Summary
This study presents a novel pure graphene and polyethylene terephthalate (PET) composite for electromagnetic interference (EMI) shielding. The material achieves high microwave absorption and shielding effectiveness while maintaining visible light transparency.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Electromagnetic interference (EMI) poses a significant challenge in electronic devices.
- Transparent EMI shielding materials are highly sought after for applications requiring both visibility and protection.
Purpose of the Study:
- To design and characterize a high-performance, transparent EMI shielding structure using pure graphene and PET.
- To investigate the shielding mechanisms and optimize the structure for enhanced microwave absorption.
Main Methods:
- Theoretical and experimental design of multi-layer graphene/PET structures.
- Characterization of shielding effectiveness, microwave absorbance, and visible transmittance.
- Analysis of the contribution of absorption versus reflection to shielding.
Main Results:
- A 4 nm graphene/PET sample achieved an average shielding effectiveness of 19.14 dB (18-26.5 GHz) and 95.82% microwave absorbance.
- Absorption accounted for over 96% of the total shielding, dominating over reflection.
- Microwave absorbance improved with increased graphene layers and layer separation.
Conclusions:
- The multi-layer graphene/PET structure offers high-performance, transparent EMI shielding.
- Absorption is the primary shielding mechanism, making it suitable for applications requiring EMI absorption.
- This material shows significant potential for transparent EMI shielding devices.
