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Controllable synthesis of unique Ni/mesoporous carbon composites with lightweight and high EM wave absorption performance

机译：具有轻量级和高EM波吸收性能的独特Ni /介孔碳复合材料的可控合成

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In present work, Ni/disordered mesoporous carbon (DMC) composites with unique structure have been prepared through a proprietary two-step process combining the sol–gel preparation of DMC and the in situ reduction of Ni from co-precipitated nickel nitrate. Confirmed by scanning electron microscopy, transmission electron microscopy and X-ray diffraction, the Ni nanoparticles were found to be sparsely dispersed in the wormhole-like channel and the mesopores, acting as scattering centres that significantly intensified the electromagnetic (EM) wave multiple reflection and improved the dielectric loss through additional interfacial polarization. Evaluation of the EM absorption properties suggested that the reflection loss (RL) was noticeably reduced from ?11.6 dB at 13 GHz to ?27 dB at 9 GHz, and the frequency bandwidth corresponding to RL < ?10 dB was broadened from about 1 GHz to over 4.5 GHz after incorporation of DMC with Ni. The experimental results show that Ni/DMC composites are superior to neat DMC so that they could be some of the most promising candidates for the new generation of EM absorption materials with improved performance and well-maintained lightweight feature.
机译：在目前的工作中，通过专有的两步工艺结合了DMC的溶胶-凝胶制备和镍从钴中的原位还原，制备了具有独特结构的Ni /无序介孔碳（DMC）复合材料。沉淀硝酸镍。经扫描电子显微镜，透射电子显微镜和X射线衍射证实，Ni纳米颗粒稀疏地分散在虫孔状通道和中孔中，作为散射中心，显着增强了电磁波的多重反射和通过额外的界面极化改善了介电损耗。电磁吸收特性的评估表明，反射损耗（ R L ）从13 GHz的？11.6 dB显着降低到了？27 dB。在9 GHz频率下，与 R L <？10 dB相对应的频率带宽从1 GHz扩展到4.5 GHz以上。带镍的DMC。实验结果表明，Ni / DMC复合材料优于纯DMC，因此它们可能成为新一代EM吸收材料的最有希望的候选者，这些材料具有改善的性能和良好的轻量化特性。

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