Segregated Conductive Polymer Composite with Fe3O4-Decorated Graphite Nanoparticles for Microwave Shielding

Author:

Matzui Ludmila Yu.1,Syvolozhskyi Oleksii A.1ORCID,Vovchenko Ludmila L.1,Yakovenko Olena S.1,Len Tetyana A.1,Ischenko Olena V.2,Vakaliuk Anna V.2,Oliynyk Victor V.1,Zagorodnii Volodymyr V.1ORCID,Naumenko Antonina1ORCID,Cojocari Maria3,Fedorov Georgy3ORCID,Kuzhir Polina3ORCID

Affiliation:

1. Facultiy of Physics, Taras Shevchenko National University of Kyiv, Volodymyrska Str. 64/13, 01601 Kyiv, Ukraine

2. Facultiy of Chemistry, Taras Shevchenko National University of Kyiv, Volodymyrska Str. 64/13, 01601 Kyiv, Ukraine

3. Department of Physics and Mathematics, University of Eastern Finland, Yliopistokatu 7, FI-80101 Joensuu, Finland

Abstract

Graphite nanoplatelets (GNPs)—the segregated ultra-high molecular weight polyethylene (UHMWPE)-based composites with hybrid filler—decorated with Fe3O4 were developed. Using X-ray diffraction and scanning electron microscopy, it was shown that the decorated component has the shape of separate granules, or their clusters were distributed evenly over the GNPs surface. The individual Fe3O4 nanoparticles are predominantly rounded, with diameters of approximately 20–60 nm. The use of GNPs/Fe3O4 as a filler leads to significant decreases in the percolation limit φc, 0.97 vol% vs. 0.56 vol% for GNPs/UHMWPE- and (GNPs/Fe3O4)/UHMWPE segregated composite material (SCM), respectively. Modification of the GNP surface with Fe3O4 leads to an essential improvement in the electromagnetic interference shielding due to enhanced microwave absorption in the 26–37 GHz frequency range in its turn by abundant surface functional groups and lattice defects of GNPs/Fe3O4 nanoparticles.

Funder

NATO SPS project G569

Research Council of Finland

Publisher

MDPI AG

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