Construction of core-shell structured SiO2@MoS2 nanospheres for broadband electromagnetic wave absorption

Herein, core-shell structured SiO2@MoS2 nanospheres were made via hydrothermal method, with MoS2 nano-sheets growing irregularly on the outside surface of SiO2. The microstructure and EM wave absorption properties of the prepared SiO2@MoS2 nanospheres were explored. SiO2@MoS2 achieved a minimum reflection loss (RLmin) value of -49.35 dB with a thickness of 2.8 mm, and an effective absorption bandwidth (EAB) of 7.44 GHz. The remarkable EM wave absorption performance of SiO2@MoS2 nanospheres could be attributed to interfacial polarization originating from the designed core-shell structure and the multiple reflections on MoS2 ultrathin nanosheets. Meanwhile, impedance matching was regulated effectively by combination of SiO2 and MoS2, which provided a synergistic effect and enhanced EM wave dissipation. Therefore, the core-shell structured SiO2@MoS2 could be a great potential candidate material in the application of high-performance EM wave absorbing area.

Automated summary

Core-shell structured SiO2@MoS2 nanospheres were prepared via hydrothermal method, with MoS2 nano-sheets irregularly growing on the outside surface of SiO2. The microstructure and EM wave absorption properties of SiO2@MoS2 nanospheres were explored. SiO2@MoS2 achieved a minimum reflection loss (RLmin) value of -49.35 dB with a thickness of 2.8 mm, and an effective absorption bandwidth (EAB) of 7.44 GHz. The remarkable EM wave absorption performance could be attributed to the interfacial polarization from the core-shell structure and multiple reflections on MoS2 ultrathin nanosheets, as well as the effective impedance matching provided by the combination of SiO2 and MoS2.