Zhang Zhi, Lv Xuliang, Cui Guangzhen, Sui Mingxu, Sun Xiaodong, Yu Songlin
Key Laboratory of Science and Technology on Electromagnetic Environmental Effects and Electro-Optical Engineering, The Army Engineering University, Nanjing 210007, China.
Research Institute for National Defense Engineering of Academy of Military Science PLA China, Beijing 100036, China.
Polymers (Basel). 2018 Nov 19;10(11):1286. doi: 10.3390/polym10111286.
A current hot topic in polymer science is the development of electromagnetic wave-absorbing materials with desired properties (i.e., proper impedance matching and strong attenuation capability), but it presents a considerable challenge. In this work, solvothermal, and self-assembled polymerization were employed for the controlled fabrication of a uniform polypyrrole (PPy) aerogel coated on hollow CuS hierarchical microspheres (CuS@PPy). The PPy coating thickness of the heterostructure could be tuned by varying the feeding weight ratios of CuS/pyrrole monomer. The electromagnetic wave absorption properties of the CuS@PPy composites were estimated to be in the frequency range 2⁻18 GHz. The as-prepared Sample B (fabricated by the addition of 35 mg CuS) showed a maximum reflection loss (RL) of -52.85 dB at a thickness of 2.5 mm. Moreover, an ultra-wide effective bandwidth (RL ≤ -10 dB) from 9.78 to 17.80 GHz (8.02 GHz) was achieved. Analysis of the electromagnetic properties demonstrated that the CuS@PPy had a remarkable enhancement compared to pure CuS platelet-based spheres and pure PPy, which can be attributed to the increased relatively complex permittivity and the promoted dielectric loss by the intense interfacial dielectric polarizations. We believe that the as-fabricated CuS@PPy can be a good reference for the fabrication of lightweight and optimal broadband absorbers.
聚合物科学当前的一个热门话题是开发具有所需特性（即适当的阻抗匹配和强衰减能力）的电磁波吸收材料，但这带来了相当大的挑战。在这项工作中，采用溶剂热法和自组装聚合法来可控制备包覆在中空硫化铜分级微球（CuS@PPy）上的均匀聚吡咯（PPy）气凝胶。通过改变CuS/吡咯单体的进料重量比，可以调节异质结构的PPy涂层厚度。估计CuS@PPy复合材料在2⁻18 GHz频率范围内具有电磁波吸收特性。制备的样品B（通过添加35 mg CuS制备）在厚度为2.5 mm时显示出最大反射损耗（RL）为-52.85 dB。此外，实现了从9.78到17.80 GHz（8.02 GHz）的超宽有效带宽（RL≤-10 dB）。电磁性能分析表明，与纯硫化铜片状球体和纯PPy相比，CuS@PPy有显著增强，这可归因于相对复介电常数的增加以及强烈的界面介电极化促进的介电损耗。我们相信，所制备的CuS@PPy可为制造轻质和最佳宽带吸收体提供良好参考。
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