Role of graphitization-controlled conductivity in enhancing absorption dominated EMI shielding behavior of pyrolysis-derived Fe3C@C-PVDF nanocomposites

Choudhary, HK and Kumar, R and Pawar, SP and Sahoo, B (2021) Role of graphitization-controlled conductivity in enhancing absorption dominated EMI shielding behavior of pyrolysis-derived Fe3C@C-PVDF nanocomposites. In: Materials Chemistry and Physics, 263 .

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Abstract

The role of improved graphitization-induced conductivity on imparting better electromagnetic interference (EMI) shielding effectiveness (SE) in the X-band frequency regime is demonstrated in pyrolysis-derived Fe3C@C based nanocomposites with PVDF polymer. Variation of synthesis temperature (Ts) is used as a strategic tool to modulate the graphitization and the associated conductivity of Fe3C@C particles. Two different carbonaceous-nanomaterials, both embedded with graphite encapsulated Fe3C-nanoparticles were synthesized at Ts = 800 °C (Fe-800) and Ts = 1000 °C (Fe-1000). We have shown that a higher synthesis temperature results in a thicker well-graphitized carbon-shell around the core (Fe3C) nanoparticles. The better degree of graphitization makes the samples better conducting. These two samples were dispersed separately in flexible polyvinylidene fluoride (PVDF) matrix to form polymer-nanocomposites. The SE of the PVDF:Fe-1000 nanocomposite film is higher than that of the PVDF:Fe-800 nanocomposite film. This high SE of the PVDF:Fe-1000 nanocomposite film is associated with the higher conductivity resulting from the higher degree of graphitization of the Fe-1000 sample. Effectively, the synergetic effects of electric and magnetic losses enhance the absorption-dominated EMI shielding of our nanocomposite-system, making them potential candidates for their direct industrial applications. Simultaneously, our work provides a strategy to control the EMI-SE of nanocomposites through control of the synthesis parameters. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Materials Chemistry and Physics
Publisher:	Elsevier Ltd
Additional Information:	The copyright for this article belongs to Elsevier Ltd
Keywords:	Electric losses; Electromagnetic pulse; Electromagnetic shielding; Fluorine compounds; Graphite; Graphitization; Iron compounds; Nanocomposites; Nanoparticles; Polymer matrix composites; Pyrolysis; Shielding; Synthesis (chemical), Graphitized carbons; Nanocomposite systems; Polymer nanocomposite; Polyvinylidene fluorides; Shielding effectiveness; Synthesis parameters; Synthesis temperatures; X-band frequencies, Nanocomposite films
Department/Centre:	Division of Chemical Sciences > Materials Research Centre
Date Deposited:	29 Dec 2021 06:06
Last Modified:	29 Dec 2021 06:06
URI:	http://eprints.iisc.ac.in/id/eprint/68178

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