Excellent microwave absorption performance from matched magnetic-dielectric properties of LSMO@RGO Nanocomposites

Abstract

Lightweight and ultrabroad electromagnetic wave absorption materials are urgently demanded to address electromagnetic (EM) interference or pollution. However, the design of excellent EM wave absorbents still remains a challenge. Herein, La0.7Sr0.3MnO3/reduced graphene oxide (LSMO@RGO) nanocomposites was successfully prepared by a facial two-step method. Three different radios of LSM to RGO (1:2, 1:1, 2:1) and four different addition (3%, 5%, 8%, 10%) for each radio were investigated, and the matched magnetic-dielectric properties of LSMO@RGO nanocomposites endows the excellent microwave absorption performance. The maximum reflection loss of LSMO@RGO nanocomposites reach as strong as −45.71 dB at a 16.47 GHz with a thickness of 2.4 mm with the addition of 5 wt.%. The ultrabroad effective absorption bandwidth of LSMO@RGO nanocomposites also can reach 7.31 GHz with a thickness of 2.8 mm. The excellent microwave absorption performance is mainly originated from the magnetic and dielectric losses as well as well-matched impedance matching. The excellent microwave absorption performance of LSMO@RGO nanocomposites especially for ultrabroad effective absorption bandwidth offer strong potentials for the design of high-performance microwave absorption materials. The material system of LSM and graphene composite was prepared for the first time, the EM absorbing properties were investigated, and this material with simple preparation process, broadband and high absorption is highly expected to be industrialized.