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Outstanding comprehensive performance versus facile synthesis: Constructing core and shell-interchangeable nanocomposites as microwave absorber

Li, Zihan, Yang, Erqi, Qi, Xiaosi, Xie, Ren, Jing, Tao, Qin, Shuijie, Deng, Chaoyong, Zhong, Wei
Journal of colloid and interface science 2020 v.565 pp. 227-238
absorption, iron oxides, molybdenum disulfide, nanocomposites, temperature
It is still a great challenge to develop high-performance microwave absorption materials (MAMs). Herein, we first proved the excellent synergistic effect of Fe₃O₄/MoS₂ heterostructure based on the theoretical calculations. To effectively utilize the synergistic effect and morphology, core and shell-interchangeable Fe₃O₄@MoS₂ and MoS₂@Fe₃O₄ nanocomposites (NCs) were elaborately constructed. By controlling the hydrothermal temperature, different MoS₂ morphologies and contents of Fe₃O₄@MoS₂ NCs were produced, which simultaneously displayed the optimal reflection loss (RL) values (~−50 dB), broad absorption bandwidth (⩾5.0GHz) and high chemical stabilities. With the synthesis temperature increasing from 170 °C to 200 °C, their outstanding microwave absorption (MA) capabilities moved towards the high frequency region and thin matching thickness. Impressively, the Fe₃O₄@MoS₂ obtained at 200 °C presented a minimum RL value of −50.75 dB with the thickness of 2.90 mm and an absorption bandwidth of 5.0 GHz with the thickness of 1.71 mm, and the excellent MA capabilities (RL values <−30 dB) with the low matching thicknesses (<2 mm) could be observed in the frequency range of X and Ku bands. Moreover, compared to the reverse structure MoS₂@Fe₃O₄, the core@shell structure Fe₃O₄@MoS₂ exhibited evidently superior MA comprehensive properties in terms of low optimal RL value, broad absorption bandwidth and high chemical stability, which could be ascribed to the improved impedance matching and microwave attenuation characteristics. Generally, the proposed flower-like core@shell structure Fe₃O₄@MoS₂ NCs presented very extraordinary MA comprehensive properties, which were very attractive candidates for high-performance MAMs.