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Amorphous/Nanocrystalline Carbonized Hydrochars with Isomeric Heterogeneous Interfacial Polarizations for High-performance Microwave Absorption

机译:具有异构异质界面极化的非晶/纳米晶碳化氢用于高效微波吸收

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摘要

Carbon allotropes and their derivatives have exhibited superior performances for microwave absorption ascribed to their dielectric attenuation capacity raised from the multiple dipolar configurations. Such characteristics could be achieved by constructing diverse microanoscale architectures, incorporating vacancies and heteroatoms, and composing with heterogeneous components. Alternatively, we herein present a facile approach for the synthesis of carbonized hydrochars, which are composed of dispersed ultrafine nanocrystallines graphite and amorphous matrix. Such a isomeric construction has a high-density interfaces, accompanied with significant interfacial polarizations, leading to the improvement of microwave absorbing capabilities. For carbonized hydrochars, the RLmin value can reach −40.36 dB, and corresponding effective bandwidth is 2 GHz. This work provides a concept for designing microwave absorption materials based on isomeric heterogeneous interfacial polarizations in single-element systems.
机译:碳同素异形体及其衍生物由于具有多种偶极构型而提高了介电衰减能力,因此具有优异的微波吸收性能。可以通过构建不同的微米/纳米级结构,合并空位和杂原子并与异质成分组成来实现此类特性。可替代地,我们在此提出了一种用于合成碳化氢炭的简便方法,该碳化氢炭由分散的超细纳米晶体石墨和无定形基质组成。这种异构体结构具有高密度的界面,并伴随着明显的界面极化,从而导致微波吸收能力的提高。对于碳化的碳氢化合物,RLmin值可达到−40.36 dB,相应的有效带宽为2 GHz。这项工作提供了一个概念,用于设计基于单元素系统中异构异构界面极化的微波吸收材料。

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