Shuping Yu , Lixue Gai , Chunhua Tian , Li Zhu , Weikang Song , Bo Hu , Xijiang Han , Yunchen Du
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引用次数: 0
摘要
界面工程和形态设计是增强碳基复合材料作为电磁波吸收材料（EWAM）性能的两种常用策略。在这里，我们将它们的优势同时整合到 MoC/Co/C 三元复合材料（SMCCs）中。一方面，高度分散的 MoC 和 Co 纳米粒子创造了丰富的异质界面，另一方面，ZnCo-MOF 衍生出的空间星状碳骨架也为电磁能耗带来了重要的结构贡献。电磁测量显示，热解温度对 SMCC 的电磁特性有很大影响。与石蜡（有机粘合剂）混合后，SMCC-800（在 800 ℃ 高温下热解）的混合物可能具有良好的阻抗匹配度和强大的电磁衰减能力。因此，SMCC-800/石蜡显示出优异的电磁吸收性能，包括在 16.2 GHz（厚度：1.8 mm）时低至 -67.3 dB 的强反射损耗强度和小于 -10.0 dB 的 6.0 GHz（12.0-18.0 GHz，厚度：2.0 mm）宽响应带宽，这些性能超过了许多具有类似化学成分的复合材料。通过研究 SMCC-800/ 石蜡混合物与各种对照样品的电磁特性，全面说明了 SMCC-800/ 石蜡的电磁吸收机制。
Interfacial engineering and morphology design are two popular strategies to strengthen the performance of carbon-based composites as electromagnetic wave absorbing materials (EWAMs). Herein, we integrate their advantages simultaneously in ternary MoC/Co/C composites (SMCCs). On one hand, highly dispersed MoC and Co nanoparticles create abundant heterogeneous interfaces, and on the other hand, the spatial star-like carbon skeletons derived from ZnCo-MOF also bring significant structure contribution to EM energy consumption. EM measurement reveals that the pyrolysis temperature greatly impacts EM properties of SMCCs. After blending with paraffin (organic binder), the mixture that involves SMCC-800 (pyrolyzed at 800 °C) may have both good impedance matching degree and powerful EM attenuation ability. As a result, SMCC-800/paraffin displays excellent EM absorption performance, including strong reflection loss intensity down to −67.3 dB at 16.2 GHz (thickness: 1.8 mm) and broad response bandwidth of 6.0 GHz (12.0–18.0 GHz, thickness: 2.0 mm) less than −10.0 dB, which outdo the performance of many composites with similar chemical composition ever reported. The EM absorption mechanism of SMCC-800/paraffin is comprehensively illustrated through the investigation on EM properties of the mixtures with various control samples.
期刊介绍：
The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.
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