Skip to main page content
U.S. flag

An official website of the United States government

Dot gov

The .gov means it’s official.
Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure you’re on a federal government site.

Https

The site is secure.
The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely.

Access keys NCBI Homepage MyNCBI Homepage Main Content Main Navigation
. 2022 Jun 20;14(12):2508.
doi: 10.3390/polym14122508.

Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding

Marius Gabriel Bontaș  1   2 , Aurel Diacon  1 , Ioan Călinescu  1 , Mădălina Ioana Necolau  1   3 , Adrian Dinescu  4 , Gabriela Toader  5 , Raluca Ginghină  6 , Alexandru-Mădălin Vizitiu  7   8 , Valentin Velicu  8   9 , Petru Palade  10 , Marcel Istrate  11 , Edina Rusen  1
Affiliations

Epoxy Coatings Containing Modified Graphene for Electromagnetic Shielding

Marius Gabriel Bontaș et al. Polymers (Basel). .

Abstract

This study presents the functionalization and characterization of graphene and electromagnetic interference (EMI) attenuation capacity in epoxy-nanocomposites. The modification of graphene involved both small molecules and polymers for compatibilization with epoxy resin components to provide EMI shielding. The TGA and RAMAN analyses confirmed the synthesis of graphene with a different layer thickness of the graphene sheets. Graphene samples with different layer thicknesses (monolayer, few layers, and multilayer) were selected and further employed for epoxy coating formulation. The obtained nanocomposites were characterized in terms of EMI shielding effectiveness, SEM, micro-CT, magnetic properties, and stress-strain resistance. The EMI shielding effectiveness results indicated that the unmodified graphene and hexamethylene diamine (HMDA) modified graphene displayed the best EMI shielding properties at 11 GHz. However, the epoxy nanocomposites based on HMDA modified graphene displayed better flexibility with an identical EMI shielding effectiveness compared to the unmodified graphene despite the formation of aggregates. The improved flexibility of the epoxy nanocomposites and EMI shielding characteristics of HMDA functionalized graphene offers a practical solution for textile coatings with microwave absorbing (MA) capacity.

Keywords: flexible epoxy textile coating; graphene functionalization; radar absorbing materials.

PubMed Disclaimer

Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Experimental setup for assessing shielding efficiency of the samples.
Figure 2
Figure 2
Optical microscopy images: (a) unmodified textile material; (b) GO-modified epoxy resin.
Figure 3
Figure 3
SEM images of unmodified textile material (A,B) and GO epoxy resin-coated textile material (C,D).
Figure 3
Figure 3
SEM images of unmodified textile material (A,B) and GO epoxy resin-coated textile material (C,D).
Figure 4
Figure 4
TGA analyses of the functionalized graphene (A) small molecules/functional groups and (B) polymers.
Figure 5
Figure 5
RAMAN spectra, ID/IG, and IG/I2D ratio for the functionalized graphene: initial graphene and functional groups modified graphene (A,C), polymer functionalized graphene (B,D).
Scheme 1
Scheme 1
Graphical representation of the graphene stacks’ thickness depending on the functionalization technique.
Figure 6
Figure 6
Electromagnetic shielding attenuation dependence on the frequency.
Figure 7
Figure 7
Transversal SEM images of the samples highlighting similar thickness.
Figure 8
Figure 8
Hysteresis loops measured at 300 K for samples MB013-MB017.
Figure 9
Figure 9
Micro-CT analyses of samples (a) MB013, (b) MB014, (c) MB015, and (d) MB017.
Figure 10
Figure 10
Comparative stress-strain plots of the thin films.
See this image and copyright information in PMC

Similar articles

See all similar articles

Cited by

References

    1. Rinaldi A., Proietti A., Tamburrano A., Sarto M.S. Graphene-Coated Honeycomb for Broadband Lightweight Absorbers. IEEE Trans. Electromagn. Compat. 2018;60:1454–1462. doi: 10.1109/TEMC.2017.2775660. - DOI
    1. Singh S.K., Akhtar M.J., Kar K.K. Impact of Al2O3, TiO2, ZnO and BaTiO3 on the microwave absorption properties of exfoliated graphite/epoxy composites at X-band frequencies. Compos. Eng. Part B. 2019;167:135–146. doi: 10.1016/j.compositesb.2018.12.012. - DOI
    1. Hisatake S., Nakajima H., Nguyen Pham H.H., Uchida H., Tojyo M., Oikawa Y., Miyaji K., Nagatsuma T. Mapping of electromagnetic waves generated by free-running self-oscillating devices. Sci. Rep. 2017;7:9203. doi: 10.1038/s41598-017-09802-0. - DOI - PMC - PubMed
    1. Teoh Y.J., Bruka M.A., Idris N.M., Ismail N.A., Muztaza N.M. Introduction of a Ground Penetrating Radar System for Subsurface Investigation in Balik Pulau, Penang Island. J. Phys. Conf. Ser. 2018;995:012098. doi: 10.1088/1742-6596/995/1/012098. - DOI
    1. Pozar D.M. Microwave Engineering. 4th ed. Wiley; Hoboken, NJ, USA: 2011.

LinkOut - more resources