Ultralight polymer-derived ceramic aerogels with wide bandwidth and effective electromagnetic absorption properties
Ultralight polymer-derived ceramic aerogels with wide bandwidth and effective electromagnetic absorption properties
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具有宽带宽和有效电磁吸收特性的超轻聚合物衍生陶瓷气凝胶
DOI：
10.1016/j.jeurceramsoc.2017.04.068
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发表时间：
2017-10
影响因子：
5.7
通讯作者：
An Linan
中科院分区：
文献类型：
--
作者：
Zhao Wanyu;Shao Gang;Jiang Mingjie;Zhao Biao;Wang Hailong;Chen Deliang;Xu Hongliang;Li Xinjian;Zhang Rui;An Linan
本文采用硅氢加成交联和冷冻干燥的方法制备了超轻聚合物陶瓷气凝胶（PDCA）。首次研究了超轻PDCA的电磁吸收性能。在1000 °C下热解的PDCA显示出均匀的三维（3D）骨架，具有10.19 g/cm 3的低堆积密度和134.48 m2/g的高表面积。利用矢量网络分析仪对PDCA的电磁性能进行了表征。PDCA在1000 °C、1200 °C和1400 °C下热解的最小反射和吸收带宽分别为−43.37 dB@7.6 GHz、−42.01 dB@12.5 GHz和−31.69 dB@17.3 GHz和3.8 GHz、6.6 GHz和4.2 GHz，频率范围为2-18 GHz。PDCA的强电磁吸收和宽带宽特征归因于微波在3D框架中的多次反射，以及高介电损耗和适当的导电性。
In this work, ultralight polymer-derived ceramic aerogels (PDCA) were prepared by a facile method of hydrosilylation crosslink and freeze drying. The electromagnetic absorption properties of ultralight PDCA were investigated for the first time. The PDCA pyrolyzed at 1000 °C shows a uniform three-dimensional (3D) framework with a low bulk density of ∼0.19 g/cm3and high surface area of 134.48 m2/g. The electromagnetic properties of PDCA were characterized by a vector network analyzer. The minimum reflection and absorption bandwidth of PDCA pyrolyzed at 1000 °C, 1200 °C and 1400 °C are −43.37 dB @ 7.6 GHz, −42.01 dB@12.5 GHz, and −31.69 dB@17.3 GHz and 3.8 GHz, 6.6 GHz and 4.2 GHz, respectively, at the frequency range of 2–18 GHz. The strong electromagnetic absorption and wide bandwidth features of PDCA could be attributed to the multiple reflections of microwaves in the 3D framework, as well as the high dielectric loss and proper conductivity.
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