查找使用阿拉丁产品的科研文献

Rational design of flower-like core–shell Fe3O4@SiO2@MoSe2 composites for high performance electromagnetic wave absorption

Li Qunbo,Yu Gaoqiang,Ye Mingquan,Han Aijun,Liu Qingzhong,Su Yaojing,Chen Cheng

Transition metal dichalcogenides (TMDCs) are considered to have remarkable electromagnetic (EM) wave attenuation due to their perfect dielectric property and graphene-like structure, but they still often fail to function due to impedance mismatch problems. Here, using a multilayer coating strategy, we prepared flower-like Fe 3 O 4 @SiO 2 @MoSe 2 absorbers with core–shell structure. SiO 2 can form the Fe 3 O 4 -SiO 2 and SiO 2 -MoSe 2 heterogeneous interfaces when it is applied to the Fe 3 O 4 surface as an impedance matching layer in the Fe 3 O 4 @SiO 2 @MoSe 2 composite, increasing the interfacial polarization loss to the absorber. In addition, Fe 3 O 4 @SiO 2 as a magnetic core also reduces the relative density of the substance compared to Fe 3 O 4 . Products with the absorption performance of various electromagnetic waves were produced by varying the amount of magnetic components (Fe 3 O 4 @SiO 2 ) in the absorber. With a minimal reflect loss (RL) of − 51.86 dB and an effective absorption bandwidth (EAB, RL < -10 dB) of 4.96 GHz at a matching thickness of 1.8 mm, the Fe 3 O 4 @SiO 2 @MoSe 2 (sample S3) demonstrated exceptional properties in EM wave absorption. In addition, we synthesized Fe 3 O 4 @MoSe 2 and determined its RL value and maximum EAB (EAB max ) in order to highlight the significance of the impedance matching layer SiO 2 . Fe 3 O 4 @MoSe 2 appears to perform less well than Fe 3 O4@SiO 2 @MoSe 2 in terms of EM wave absorption, with a minimal RL value of -50.20 dB and an EAB max of only 2.00 GHz at the matching thickness of 4.8 mm. The remarkable properties in EM wave absorption of Fe 3 O 4 @SiO 2 @MoSe 2 is the result of the combined effect from impedance match and loss mechanisms of various compositions, so the component SiO 2 has a non-negligible function as an impedance matching layer. This study has blazed the trail for developing the lightweight and excellent performance of absorbers.