Swift heavy-ions irradiated nano-magnetite/exfoliated-nanographite/polymethylmethacrylate nanocomposites with excellent microwave-absorption performance

摘要

In this work, a new method (swift heavy-ion (SHI) irradiation) has been adopted to develop the lightweight nano-magnetite/exfoliated-nanographite/polymethylmethacrylate (Fe3O4/NG/PMMA) nanocomposites with strong and broadband MW absorbing characteristics. The effects of SHI [C6+(80 MeV) and O7+(100 MeV)] irradiation on MW-absorbing properties of Fe3O4/NG/PMMA nanocomposites were investigated in 2-18 GHz frequency range. Irradiated nanocomposites demonstrated better homogenization of nanofillers, lower saturation magnetization, higher coercivity, stronger MW-absorption and higher effective bandwidth of absorption. Nanocomposites irradiated with O7+(100 MeV) ions at fluence of 1 x 10(12) ions/cm(2) exhibited a minimum reflection loss (R-Lmin) of -32.4 dB (99.94% MW-absorption) and broad bandwidth (for R-L <= -10 dB) of similar to 6.8 GHz. (C) 2019 Published by Elsevier B.V.