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Poly(vinylidene fluoride)-based flexible and lightweight materials for attenuating microwave radiations
Maya Sharma1, Mahander Pratap Singh, Chandan Srivastava
1Center for Nano Science and Engineering, ‡Department of Materials Engineering, and §Department of Chemical Engineering, Indian Institute of Science , Bangalore 560012, India.
ACS Applied Materials & Interfaces
|November 11, 2014
Summary
New composites using graphene oxide, barium titanate, cobalt nanowires, and carbon nanotubes significantly attenuate electromagnetic radiation. These materials also enhance thermal conductivity, paving the way for lightweight shielding solutions.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetism
Background:
- Electromagnetic interference (EMI) shielding materials are crucial for protecting electronic devices.
- Developing lightweight and flexible EMI shielding materials with high performance is an ongoing challenge.
- Combining ferroelectric/ferromagnetic materials with conductive nanoparticles can enhance EMI attenuation through electrical and magnetic dipoles.
Purpose of the Study:
- To develop novel poly(vinylidene fluoride) (PVDF)-based composites for electromagnetic radiation attenuation.
- To investigate the synergistic effects of graphene oxide (GO), barium titanate (BT) nanoparticles, cobalt nanowires (Co-NWs), and multiwall carbon nanotubes (CNTs) on EMI shielding properties.
- To enhance both dielectric and magnetic properties for improved EMI shielding effectiveness.
Main Methods:
- Synthesis of graphene oxide (GO) sheets covalently grafted onto barium titanate (BT) nanoparticles.
- Synthesis of cobalt nanowires (Co-NWs) via electrodeposition.
- Preparation of three-phase hybrid composites by solution blending PVDF with BT-GO or Co-NWs and CNTs.
- Characterization of dielectric constant, magnetic permeability, saturation magnetization, coercivity, electrical conductivity, and thermal conductivity.
Main Results:
- PVDF/BT-GO composites showed a higher dielectric constant than PVDF/BT and PVDF/GO composites.
- Co-NWs exhibited a saturation magnetization (Ms) of 40 emu/g and coercivity (Hc) of 300 G.
- The hybrid composites (BT-GO/CNT and Co-NWs/CNT) demonstrated significant EMI radiation attenuation in the X-band and Ku-band.
- Thermal conductivity of PVDF was enhanced by approximately 8.7- and 9.3-fold with BT-GO/CNT and Co-NWs/CNT, respectively.
Conclusions:
- The developed PVDF-based composites effectively attenuate electromagnetic radiation.
- The combination of ferroelectric (BT-GO) or ferromagnetic (Co-NWs) materials with conductive CNTs enhances EMI shielding performance.
- These materials offer a promising route for designing flexible and lightweight electromagnetic interference shielding applications.
