Chen Peng, Jiang Lin-Wen, Yang Shan-Shan, Chen Hong-Bing, He Jun, Wang Yu, An Jing
State Key Laboratory Base of Functional Materials and Its Preparation Science, Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province, Ningbo University, Ningbo 315211, P. R. China.
Division of Functional Material Research, Central Iron & Steel Research Institute, Beijing 100081, P. R. China.
J Nanosci Nanotechnol. 2020 Mar 1;20(3):1756-1764. doi: 10.1166/jnn.2020.17150.
Organic-inorganic CoFe₂O₄/polyaniline (CoFe₂O₄/PA) nanocomposites with embedded structures were synthesized by combining the sol-gel auto-combustion process and oxidative polymerization. The phases and morphologies of the prepared samples were identified. The pure CoFe₂O₄ samples exhibited inferior microwave-absorption properties in a frequency range of 2-18 GHz. Upon the incorporation of PA, the formed CoFe₂O₄/PA nanocomposites exhibited rather good absorption performances. When the sample thickness was 2.5 mm, the maximum reflection loss (RL) reached -22.3 dB, while the RL below -10 dB corresponded to the range of 11.0-17.1 GHz, which contains almost the entire Ku-band, making the structure promising for commercial and military applications. A physical model was employed to explain the effects of the embedded structure on the microwave-absorption performances. The excellent microwave-absorption performances could be attributed to the interfacial polarization and repeated reflection of the microwaves inside the CoFe₂O₄/PA composite.
通过溶胶-凝胶自燃烧法和氧化聚合法相结合，合成了具有嵌入式结构的有机-无机CoFe₂O₄/聚苯胺（CoFe₂O₄/PA）纳米复合材料。对制备的样品的相和形貌进行了鉴定。纯CoFe₂O₄样品在2-18 GHz频率范围内表现出较差的微波吸收性能。加入PA后，形成的CoFe₂O₄/PA纳米复合材料表现出相当好的吸收性能。当样品厚度为2.5 mm时，最大反射损耗（RL）达到-22.3 dB，而RL低于-10 dB对应于11.0-17.1 GHz的范围，几乎涵盖了整个Ku波段，使得该结构在商业和军事应用方面具有潜力。采用物理模型来解释嵌入式结构对微波吸收性能的影响。优异的微波吸收性能可归因于CoFe₂O₄/PA复合材料内部微波的界面极化和多次反射。
Zotero 插件