Fig. 7
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Flexible PMCs for epsilon-negative metacomposites. Permittivity spectra of MWCNTs/PDMS composites (a, b) [69] Copyright © 2017, Elsevier; Permittivity spectra of graphene/PDMS composites (c, d) [70] Copyright © 2019, American Chemical Society; Permittivity spectra of graphene/PVA composites (e, f) [71] Copyright © 2020, John Wiley and Sons.
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