Achieving Excellent Electromagnetic Wave Absorption Capabilities by Construction of MnO Nanorods on Porous Carbon Composites Derived from Natural Wood via a Simple Route
Achieving Excellent Electromagnetic Wave Absorption Capabilities by Construction of MnO Nanorods on Porous Carbon Composites Derived from Natural Wood via a Simple Route
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DOI：
10.1021/acssuschemeng.9b02100
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发表时间：
2019-07-01
影响因子：
8.4
通讯作者：
Hu, Ping
中科院分区：
文献类型：
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作者：
Dong, Shun;Tang, Weikang;Hu, Ping
吸波材料具有重量轻、填充量低、吸收容量大、吸收带宽宽等特点，因此利用可再生材料和可再生材料设计高性能的生物质微波吸波材料已成为人们广泛关注的问题。在这里，我们首次用一种简单的方法构建了多孔生物质衍生碳(PBDC)与原位生长的MnO纳米棒(MnORs)修饰的柔性高性能电磁吸波材料。这些复合材料的化学组成和微观结构特征高度依赖于通过高锰酸钾浓度控制的MnORs的含量，因此其电磁性能也是可以控制的。与纯PBDC相比，MnOnRs/PBDC复合材料具有良好的吸波性能，在10.4 GHz处的最小反射损耗(RLmin)为-51.6dB，厚度为2.47 mm，带宽为14.2 GHz，集成厚度为1.00~5.00 mm。值得注意的是，这种新型复合材料的微波吸收能力不像普通的碳基吸波材料那样受MnORs含量的影响，这可能归因于PBDC和MnORs之间的协同效应以及层次化结构。这项工作可能为生物质作为低成本、绿色、可再生的高性能碳基吸收器的发展提供新的指导方针。
Absorbers with light weight, low filler loading, high absorption capacity, and broad absorption bandwidth are highly desirable for electromagnetic (EM) wave absorption application, and extensive efforts in designing excellent performance biomass-derived microwave absorbents using sustainable and renewable materials have been made. Here, for the first time we constructed flexible and high-performance EM-absorbing materials of porous biomass-derived carbon (PBDC) decorated with in-situ grown MnO nanorods (MnOnrs) by a simple process. The chemical composition and microstructural feature of these MnOnrs/PBDC composites are highly dependent on the content of MnOnrs controlled through the concentration of potassium permanganate, and thus their EM properties could be also manipulated. Compared with the pure PBDC, the MnOnrs/PBDC composites exhibited excellent EM wave absorption performance with the minimum reflection loss (RLmin) of -51.6 dB at 10.4 GHz with a thickness of 2.47 mm and a qualified bandwidth of 14.2 GHz with an integrated thickness from 1.00 to 5.00 mm. Notably, the microwave absorption capacity of this new kind of composite is not so susceptible to the content of MnOnrs as those common carbon-based absorbers, which could be attributed to the synergistic effect between PBDC and MnOnrs as well as the hierarchical structure. This work may provide a new guideline for development of biomass as a low-cost, green, and renewable high-performance, carbon-based absorber.