Related Experiment Video
Updated: Aug 28, 2025
07:41
Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
Published on: July 19, 2016
7.8K
Ultrathin structures derived from interfacially modified polymeric nanocomposites to curb electromagnetic pollution
Kumari Sushmita1, Petr Formanek2, Dieter Fischer2
1Centre for Nanoscience and Engineering, Indian Institute of Science Bangalore-560012 India.
Nanoscale Advances
|September 22, 2022
Summary
Researchers developed ultrathin multilayered films using polyvinylidene difluoride (PVDF) and polycarbonate (PC) nanocomposites to combat electromagnetic (EM) pollution. These advanced materials offer exceptional electromagnetic interference (EMI) shielding by primarily absorbing EM waves.
Area of Science:
- Materials Science
- Nanotechnology
- Electromagnetics
Background:
- Increasing use of electronic devices leads to escalating electromagnetic (EM) pollution.
- Effective remediation of EM pollution requires novel materials with superior shielding capabilities.
- Existing solutions face challenges in structural integrity and performance, especially under thermal stress.
Purpose of the Study:
- To fabricate ultrathin multilayered nanocomposite films for enhanced electromagnetic interference (EMI) shielding.
- To improve the structural properties and interfacial adhesion of polymer-based shielding materials.
- To investigate the efficacy of nanohybrid structures and polymer interlayers in EMI shielding.
Main Methods:
- Sequential stacking of polyvinylidene difluoride (PVDF) and polycarbonate (PC) nanocomposite thin films.
- Interfacial stitching using polymethyl methacrylate (PMMA) to enhance adhesion between immiscible polymers.
- Incorporation of reduced graphene oxide-ferrite (rGO-Fe3O4) or molybdenum disulfide-ferrite (MoS2-Fe3O4) nanohybrids into PVDF.
- Dispersion of multiwall carbon nanotubes (CNTs) in the PC component.
- Characterization using SEM/EDS, Raman mapping/imaging, and dynamic mechanical analysis (DMA).
Main Results:
- Achieved ultrathin multilayered assemblies (approx. 53 μm) with enhanced structural integrity and mechanical stability.
- Demonstrated a high storage modulus of 2767 MPa at 40 °C for a specific multilayer configuration.
- Attained a high EMI shielding effectiveness (SE_T) of -26.3 dB at 26.5 GHz for a 9-multilayer assembly (approx. 480 μm).
- Confirmed that EMI suppression was primarily achieved through absorption.
Conclusions:
- The developed multilayered assembly strategy effectively enhances EMI shielding performance.
- Interfacial engineering with PMMA significantly improves the structural properties of polymer nanocomposites.
- The nanohybrid structures and CNTs contribute to the superior absorption-based EMI shielding mechanism.
- This approach offers a promising solution for mitigating electromagnetic pollution from electronic devices.
