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Facile synthesis of NiS2@MoS2 core–shell nanospheres for effective enhancement in microwave absorption

机译：NiS 2 @MoS 2 核-壳纳米球的简便合成，可有效增强微波吸收

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摘要

Core–shell structured NiS2@MoS2 nanospheres have been successfully fabricated via a facile hydrothermal method. The structure and morphology of the nanospheres were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). The results indicated that this unique core–shell structure was beneficial to high-performance microwave absorption. A possible absorption mechanism was explained in detail. As an absorber, nanocomposites with a filler loading of 20 wt% exhibited enhanced microwave absorption properties due to characteristic impedance matching, synergistic effects, dipole and interface polarization, multiple reflections and quarter-wavelength matching. The minimum reflection loss can reach ?41.05 dB at 12.08 GHz, and the absorption bandwidth exceeding ?10 dB is 4.4 GHz with a thickness of 2.2 mm.
机译：通过通过成功制备了核壳结构的NiS 2 @MoS 2 纳米球一种简便的水热法。通过X射线衍射（XRD），X射线光电子能谱（XPS），扫描电子显微镜（SEM），场发射扫描电子显微镜（FESEM）和透射电子显微镜（TEM）来表征纳米球的结构和形态。结果表明，这种独特的核-壳结构有利于高性能微波吸收。详细解释了可能的吸收机理。作为吸收剂，由于特征阻抗匹配，协同效应，偶极和界面极化，多次反射和四分之一波长匹配，具有20 wt％填料填充量的纳米复合材料表现出增强的微波吸收性能。最小反射损耗在12.08 GHz时可达到4141.05 dB，超过？10 dB的吸收带宽为4.4 GHz，厚度为2.2 mm。

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