Qi Yali, Yin Pengfei, Zhang Limin, Wang Jian, Feng Xing, Wang Kaiming, Zhao Liang, Sun Xiyuan, Dai Jianwu
College of Science and College of Mechanical and Electrical Engineering, Sichuan Agricultural University, Ya'an 625014, P. R. China.
Key Laboratory of Space Applied Physics and Chemistry (Ministry of Education), School of Science, Northwestern Polytechnical University, Xi'an 710072, P. R. China.
ACS Omega. 2019 Jul 19;4(7):12376-12384. doi: 10.1021/acsomega.9b01568. eCollection 2019 Jul 31.
A novel magnetic nanocomposite of Ni Mn FeO/carbonized chaff ( = 0.3, 0.5, and 0.7) has been synthesized successfully via the co-carbonization and hydrothermal method. The microstructure, morphology, complex permittivity and permeability, and microwave absorbing properties were systematically studied by X-ray diffraction, scanning electron microscopy, and a vector network analyzer. Compared to the pure NiMnFeO NPs, the NiMnFeO/carbonized chaff-N composite exhibits an optimal microwave absorption property at 4 mm as the mass percent of carbonized chaff is 10 wt %, the maximum reflection loss of which can reach -14.58 dB at 1.91 GHz with the -10 dB frequency bandwidth in the range of 1.46-2.41 GHz (0.95 GHz). The enhanced electromagnetic wave absorbing performance is ascribed to the good synergistic effect among laminated structures, better impedance matching condition, strong natural resonance loss, Debye dipolar relaxation to some extent, and so forth. Most importantly, this study provides a novel way to prepare easily degradable, environment-friendly, and high-efficiency electromagnetic wave absorbers by utilizing the structural property of renewable biomaterials.
通过共碳化和水热法成功合成了一种新型的NiMnFeO/碳化稻壳磁性纳米复合材料（= 0.3、0.5和0.7）。采用X射线衍射、扫描电子显微镜和矢量网络分析仪系统研究了其微观结构、形貌、复介电常数和磁导率以及微波吸收性能。与纯NiMnFeO纳米颗粒相比，当碳化稻壳的质量百分比为10 wt%时，NiMnFeO/碳化稻壳-N复合材料在4 mm处表现出最佳的微波吸收性能，其最大反射损耗在1.91 GHz时可达-14.58 dB，-10 dB频率带宽在1.46-2.41 GHz范围内（0.95 GHz）。电磁波吸收性能的增强归因于层状结构之间良好的协同效应、更好的阻抗匹配条件、较强的自然共振损耗、一定程度的德拜偶极弛豫等。最重要的是，本研究提供了一种利用可再生生物材料的结构特性制备易于降解、环境友好且高效的电磁波吸收剂的新方法。
