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首页> 外文期刊>RSC Advances >Facile design of a ZnO nanorod–Ni core–shell composite with dual peaks to tune its microwave absorption properties
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Facile design of a ZnO nanorod–Ni core–shell composite with dual peaks to tune its microwave absorption properties

机译：具有双峰的ZnO纳米棒-Ni核-壳复合材料的便捷设计，可调节其微波吸收性能

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In this study, we report a facile one-pot hydrothermal way to prepare magnetic-dielectric Ni/ZnO composites. The effects of different solvents on the sizes and morphologies were investigated. The as-synthesized composites were characterized by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, transmission electron microscopy (TEM), and vector network analyses. The results showed that the viscosity of the solvents plays an important role in determining the sizes and morphologies of the Ni/ZnO products. All of the three Ni/ZnO products possessed two wide attractive absorption bands, which could broaden the effective absorption bandwidth. The absorption peaks located at a relatively high frequency were related to strong dielectric resonances, which could induce a high eddy current effect, therefore prompting microwave absorption. Among the three Ni/ZnO composites, the core–shell Ni@ZnO prepared in ethylene glycol solution exhibited the best microwave absorption properties. The optimal reflection loss was ?30.2 dB and the effective bandwidth (RL below ?10 dB, meaning 90% microwave absorption) could be adjusted in the frequency range of 9.6–14.3 GHz with a low thickness of 1.7–2.5 mm. The outstanding absorption was attributed to suitable impedance matching, an antenna receiver mechanism and a point charge effect, and the interfacial polarization. This study reports a simple method to design a magnetic metal-dielectric semiconductor absorber.
机译：在这项研究中，我们报告了一种简便的一锅水热法来制备磁电介质Ni / ZnO复合材料。研究了不同溶剂对尺寸和形貌的影响。合成后的复合材料通过X射线衍射，扫描电子显微镜，振动样品磁力分析，透射电子显微镜（TEM）和矢量网络分析进行了表征。结果表明，溶剂的粘度在确定Ni / ZnO产物的尺寸和形态方面起着重要作用。三种Ni / ZnO产物均具有两个宽的吸引吸收带，可以扩大有效吸收带宽。处于较高频率的吸收峰与强介电共振有关，这可能引起高涡流效应，从而促进微波吸收。在这三种Ni / ZnO复合材料中，在乙二醇溶液中制备的核壳型Ni @ ZnO具有最佳的微波吸收性能。最佳反射损耗为？30.2 dB，有效带宽（RL低于？10 dB，意味着90％的微波吸收）可以在9.6–14.3 GHz的频率范围内进行调节，且厚度低至1.7–2.5 mm。出色的吸收归因于合适的阻抗匹配，天线接收器机制和点电荷效应以及界面极化。这项研究报告了一种设计磁性金属-电介质半导体吸收器的简单方法。

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