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Related Experiment Video

Updated: Sep 6, 2025

Graphene Coatings for Biomedical Implants

Graphene Coatings for Biomedical Implants

Published on: March 1, 2013

Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding.

Marius Gabriel Bontaș^1,2, Aurel Diacon¹, Ioan Călinescu¹

¹Faculty of Chemical Engineering and Biotechnologies, University Politehnica Bucharest, Gh. Polizu Street, 011061 Bucharest, Romania.

|June 24, 2022

Summary

Functionalized graphene enhances epoxy nanocomposites for electromagnetic interference (EMI) shielding. Modified graphene offers improved flexibility and EMI attenuation, suitable for microwave absorbing textile coatings.

Keywords:

flexible epoxy textile coating graphene functionalization radar absorbing materials

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Area of Science:

Materials Science
Nanotechnology
Polymer Science

Background:

Graphene's unique properties make it a candidate for electromagnetic interference (EMI) shielding applications.
Developing effective EMI shielding materials requires optimizing graphene's compatibility with polymer matrices.
Functionalization of graphene is crucial for enhancing its dispersion and performance in nanocomposites.

Purpose of the Study:

To functionalize graphene for improved compatibility with epoxy resins.
To characterize the electromagnetic interference (EMI) shielding capacity of graphene-epoxy nanocomposites.
To evaluate the mechanical and functional properties of modified graphene-based nanocomposites for potential applications.

Main Methods:

Graphene functionalization using small molecules and polymers.
Synthesis and characterization of graphene-epoxy nanocomposites.
Analysis of EMI shielding effectiveness, SEM, micro-CT, magnetic properties, and stress-strain behavior.

Main Results:

Thermogravimetric analysis (TGA) and Raman spectroscopy confirmed graphene synthesis with varying layer thicknesses.
Unmodified and hexamethylene diamine (HMDA)-modified graphene exhibited superior EMI shielding at 11 GHz.
HMDA-modified graphene nanocomposites showed enhanced flexibility with comparable EMI shielding to unmodified graphene.

Conclusions:

HMDA functionalization improves graphene dispersion and flexibility in epoxy nanocomposites.
The developed nanocomposites offer a practical solution for microwave absorbing (MA) textile coatings.
Functionalized graphene holds promise for advanced EMI shielding and flexible electronic applications.