Xu Dongwei, Guo Huanhuan, Zhang Feifan, Wu Yanmei, Guo Xiaoqin, Ren Yumei, Feng Desheng
School of Material Science and Engineering, Henan Key Laboratory of Aeronautical Materials and Application Technology, Zhengzhou University of Aeronautics, Zhengzhou 450046, China.
Nanomaterials (Basel). 2022 Aug 21;12(16):2876. doi: 10.3390/nano12162876.
Hollow nanoboxes structure have raised great attention as microwave absorption materials on account of their ultralow density and large specific area. By introducing an adjustable interior cavity structure, the dielectric loss and microwave absorption performance were affected by the tunable complex permittivity and impedance matching was improved. In our study, hollow CoS nanoboxes with designable interspaces were successfully fabricated based on the surfactant-assisted solution method and followed by an in situ ion-exchange process. The structure, elemental compositions and morphology of the products were characterized by XRD, XPS, EDX, SEM and TEM, respectively. In addition, microwave absorption performance and the intrinsic mechanism are investigated in-depth. The paraffin-based composites with 20 wt.% filling contents exhibited superior microwave absorption capacities in view of both maximum reflection loss value (, -54.48 dB) and effective absorption bandwidth (, below -10 dB, 6.0 GHz), which can be ascribed to unique hollow structure and good impedance matching. With these considerations in mind, this study provides a reference for the construction of high-performance microwave absorbers with unique hollow structure.
中空纳米盒结构因其超低密度和大比表面积作为微波吸收材料而备受关注。通过引入可调节的内部空腔结构，介电损耗和微波吸收性能受到可调复介电常数的影响，并且改善了阻抗匹配。在我们的研究中，基于表面活性剂辅助溶液法并随后进行原位离子交换过程，成功制备了具有可设计间隙的中空CoS纳米盒。分别通过XRD、XPS、EDX、SEM和TEM对产物的结构、元素组成和形貌进行了表征。此外，对微波吸收性能和内在机制进行了深入研究。填充量为20 wt.%的石蜡基复合材料在最大反射损耗值（，-54.48 dB）和有效吸收带宽（，低于-10 dB，6.0 GHz）方面均表现出优异的微波吸收能力，这可归因于独特的中空结构和良好的阻抗匹配。考虑到这些因素，本研究为构建具有独特中空结构的高性能微波吸收体提供了参考。
