College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
College of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, PR China.
J Colloid Interface Sci. 2017 Dec 15;508:462-468. doi: 10.1016/j.jcis.2017.08.074. Epub 2017 Aug 23.
Design of dielectric/magnetic heterostructure and multiple interfaces is a challenge for the microwave absorption. Thus, in this study, a novel C/FeC nanocomposites have been fabricated by annealing the precursors obtained by the facile chemical blowing of polyvinyl pyrrolidone (PVP) and Fe(NO)·9HO. By changing the content of Fe(NO)·9HO, the honeycomb-like structure with scads of pores and electromagnetic parameters could be successfully tailored. When the addition of Fe(NO)·9HO is ranging from 1 to 2g, honeycomb-structured nanocomposites possess high performance microwave absorption when mixed with 90wt% paraffin. The minimal reflection loss is -37.4dB at 13.6GHz and effective bandwidth can reach to 5.6GHz when the thickness is 2.0mm, indicating its great potential in microwave absorbing field. Its outstanding microwave performance is tightly related to the porous structure and substantial interface such as carbon/air and carbon/FeC, which are in favor of the impedance matching and interfacial polarization. Thus, our study may provide a good reference for the facile synthesis of light-weight carbon-based nanocomposites with effective interfacial polarization.
设计介电/磁性异质结构和多个界面是微波吸收的一个挑战。因此，在这项研究中，通过退火由简单的聚吡咯烷酮（PVP）和 Fe(NO)·9HO 化学发泡得到的前体，制备了一种新型的 C/FeC 纳米复合材料。通过改变 Fe(NO)·9HO 的含量，可以成功地调整具有大量孔和电磁参数的蜂窝状结构。当添加的 Fe(NO)·9HO 的量从 1g 到 2g 变化时，当与 90wt%的石蜡混合时，具有蜂窝状结构的纳米复合材料具有优异的微波吸收性能。在厚度为 2.0mm 时，最小反射损耗为-37.4dB，有效带宽可达 5.6GHz，表明其在微波吸收领域具有巨大的潜力。其优异的微波性能与多孔结构和大量的界面（如碳/空气和碳/FeC）密切相关，这有利于阻抗匹配和界面极化。因此，我们的研究可能为简便合成具有有效界面极化的轻质碳基纳米复合材料提供良好的参考。
