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PET/Ag NW/PMMA transparent electromagnetic interference shielding films with high stability and flexibility
Xingzhong Zhu1, Aoqi Guo1, Zhiyang Yan2
1College of Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. cxkan@nuaa.edu.cn.
Nanoscale
|April 21, 2021
Summary
Researchers developed flexible transparent films using silver nanowires (Ag NWs) and polymethyl methacrylate (PMMA) for electromagnetic interference (EMI) shielding. These films offer excellent conductivity, transparency, and durability for advanced electronic devices.
Area of Science:
- Materials Science
- Nanotechnology
- Optoelectronics
Background:
- Flexible transparent electromagnetic interference (EMI) shielding is crucial for modern optoelectronic devices.
- Existing solutions often compromise transparency or flexibility.
Purpose of the Study:
- To fabricate and characterize novel flexible transparent EMI shielding films.
- To evaluate the performance of Ag NWs and PMMA composite films.
Main Methods:
- Fabrication of sandwich-structured films (PET/Ag NW/PMMA) using Mayer-rod coating and spin-coating.
- Characterization of film morphology, sheet resistance, optical transmittance, and EMI shielding effectiveness.
- Assessment of flexibility and environmental stability.
Main Results:
- Achieved films with low root mean square roughness (4 nm).
- Demonstrated high figure of merit (447) with sheet resistance of 21 Ω sq⁻¹ and transmittance of 95.6%.
- Exhibited remarkable flexibility after 10,000 bending cycles and stability under harsh conditions (80 °C/80% RH for 600 h).
- Attained EMI shielding effectiveness of 21.3 dB with high optical transmittance.
Conclusions:
- The PET/Ag NW/PMMA films offer a promising combination of transparency, flexibility, and EMI shielding.
- Absorption is the dominant EMI shielding mechanism.
- These materials hold significant potential for commercial transparent EMI shielding applications in flexible optoelectronics.
