Terahertz absorption in graphite nanoplatelets/polylactic acid composites
- 1. 1 Research Institute for Nuclear Problems Belarusian State University, Bobruiskaya str. 11, Minsk, 220030, Belarus; 2 OLEM, Institute of Mechanics Bulgarian Academy of Sciences, Acad. G. Bonchev str. 4, Sofia, 1113, Bulgaria; 3 University of Exeter, Exeter, EX4 4QL, United Kingdom; 4 Tomsk State University, 36 Lenin Prospekt, Tomsk 634050, Russia
Description
The electromagnetic properties of composite materials based on poly(lactic) acid (PLA) filled with graphite nanoplatelets (GNP) were investigated in the microwave (26–37 GHz) and terahertz (0.2–1 THz) frequency ranges. The maximum of the imaginary part of the dielectric permittivity was observed close to 0.6 THz for composites with 1.5 and 3 wt.% of GNP. The experimental data of complex dielectric permittivity of GNP/PLA composites was modelled using the Maxwell-Garnett theory. The effects of fine dispersion, agglomeration, and percolation in GNP-based composites on its electromagnetic constitutive parameters, presence, and position of THz absorption peak are discussed on the basis of the modeling results and experimental data. The unique combination of conductive and geometrical parameters of GNP embedded into the PLA matrix below the percolation threshold allow us to obtain the THz-absorptive material, which may be effectively used as a 3D-printing filament.
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Terahertz absorption in graphite nanoplatelets-polylactic acid composites - full article.pdf
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