Dual strategy of A-site ion substitution and self-assembled MoS2 wrapping to boost permittivity for reinforced microwave absorption performance

With the rapid development of electronic technology, how to effectively eliminate electromagnetic pollution has become a serious problem. Perovskite oxides have shown great potential in the field of electromagnetic wave absorption due to their unique structure and excellent physicochemical properties. Herein, by rationally manipulating the A-site ion substitution strategy, the theoretically directed doping of Sr ions into La ionic sites was utilized and the layered MoS2 was loaded by the hydrothermal process to modify its surface. Consequently, the introduced polarization phenomenon improved the dielectric performance of the perovskite oxides, achieving a collaborative dielectric/magnetic loss mechanism. Accordingly, the prepared La0.7Sr0.3FeO3(LSFO)/MoS2 as coating filler in the epoxy resin coating system can obtain the minimum reflection loss of –67.09 dB at 1.9 mm and the maximum effective absorption bandwidth of 7.28 GHz at 2.3 mm. More importantly, it also exhibits excellent absorption performance for multi-band electromagnetic waves, covering a wide range of specified frequency bands. It provides inspiration for exploring novel perovskite oxide-based electromagnetic wave absorbing coatings and broadens the choice of ideal candidate materials for designing highly efficient, multi-band absorbers to cope with sophisticated electromagnetic environments.