Preparation of broad-bandwidth porous carbon electromagnetic wave absorption materials from agricultural waste corncob

IF 4.3 3区材料科学 Q2 MATERIALS SCIENCE, COATINGS & FILMS Diamond and Related Materials Pub Date : 2024-10-22 DOI:10.1016/j.diamond.2024.111688

Yi Teng , Lihui Xu , Hong Pan , Meng Wang , Meiran Dou , Yingxiu Zhang , Xueqiang Fu , Zhangyong Liu , Xinzhe Huang , Hong Zhao

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Abstract

Developing advanced electromagnetic wave-absorbing materials tend to focus on the characteristics of low cost, renewability, environmental friendliness, strong absorption, wide bandwidth, and lightweight. This paper described the preparation of porous carbon electromagnetic wave-absorbing materials with strong absorption, broad bandwidth and thin thickness by one-step charring of corncob, an agricultural waste. The corncob porous carbon (CPC) materials were prepared when the charring temperature was 600 °C, the charring time was 3 h and the activator ratio was 0.25:1. The obtained CPC exhibited porous microstructure with average pore size of approximately 1 μm. Its specific surface area was 713.971 m²·g⁻¹, with pore volume of 0.289 mL·g⁻¹ and high degree graphitization. CPC showed excellent electromagnetic wave absorption performance with minimum reflection loss (RL _min) of −38.21 dB and effective absorption bandwidth (EAB) of 5.6 GHz at a relatively thin thickness of 2.0 mm. CPC was capable of absorbing 99.9 % of electromagnetic wave (EMW).

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利用农业废弃玉米芯制备宽频带多孔碳电磁波吸收材料

开发先进的电磁波吸收材料往往注重低成本、可再生、环保、强吸收、宽频带、轻质等特点。本文介绍了利用农业废弃物玉米芯一步炭化法制备吸波强、带宽宽、厚度薄的多孔碳电磁波吸收材料。炭化温度为 600 ℃，炭化时间为 3 h，活化剂比例为 0.25:1。得到的 CPC 具有多孔的微观结构，平均孔径约为 1 μm。其比表面积为 713.971 m2-g-1，孔体积为 0.289 mL-g-1，石墨化程度高。CPC 具有优异的电磁波吸收性能，在厚度为 2.0 mm 的相对较薄的情况下，其最小反射损耗（RL min）为 -38.21 dB，有效吸收带宽（EAB）为 5.6 GHz。CPC 能够吸收 99.9 % 的电磁波（EMW）。

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来源期刊

Diamond and Related Materials 工程技术-材料科学：综合

CiteScore

6.00

自引率

14.60%

发文量

702

审稿时长

2.1 months

期刊介绍： DRM is a leading international journal that publishes new fundamental and applied research on all forms of diamond, the integration of diamond with other advanced materials and development of technologies exploiting diamond. The synthesis, characterization and processing of single crystal diamond, polycrystalline films, nanodiamond powders and heterostructures with other advanced materials are encouraged topics for technical and review articles. In addition to diamond, the journal publishes manuscripts on the synthesis, characterization and application of other related materials including diamond-like carbons, carbon nanotubes, graphene, and boron and carbon nitrides. Articles are sought on the chemical functionalization of diamond and related materials as well as their use in electrochemistry, energy storage and conversion, chemical and biological sensing, imaging, thermal management, photonic and quantum applications, electron emission and electronic devices. The International Conference on Diamond and Carbon Materials has evolved into the largest and most well attended forum in the field of diamond, providing a forum to showcase the latest results in the science and technology of diamond and other carbon materials such as carbon nanotubes, graphene, and diamond-like carbon. Run annually in association with Diamond and Related Materials the conference provides junior and established researchers the opportunity to exchange the latest results ranging from fundamental physical and chemical concepts to applied research focusing on the next generation carbon-based devices.