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Pore-regulation in 2D biochar-based flakes towards wideband microwave absorption

文献类型： 外文期刊

作者： Yan, Han 1 ; Lou, Zhichao 1 ; Xu, Lei 4 ; Lv, Hualiang 2 ;

作者机构： 1.Nanjing Forestry Univ, Jiangsu Coinnovat Ctr Efficient Proc & Utilizat Fo, Nanjing 210037, Peoples R China

2.Fudan Univ, Inst Optoelect, Shanghai 200433, Peoples R China

3.Nanjing Forestry Univ, Coll Mat Sci & Engn, Nanjing 210037, Peoples R China

4.Jiangsu Acad Agr Sci, Inst Agr Facil & Equipment, Nanjing 210014, Jiangsu, Peoples R China

关键词： Biochar; Electromagnetic wave absorption; Porous structure; Bamboo; Dielectric loss

期刊名称：CHEMICAL ENGINEERING JOURNAL （ 影响因子：15.1； 五年影响因子：14.3 ）

ISSN： 1385-8947

年卷期： 2023 年 464 卷

页码：

收录情况： SCI

摘要： The rational use of agroforestry waste and the development of highly efficient electromagnetic wave absorbing materials have attracted a lot of attention. Carbon based electromagnetic wave absorbing materials derived from agroforestry waste have the advantages of low density, stable physicochemical properties, and therefore they became a research hotspot. However, the good conductivity, high permittivity of pure carbon materials are prone to electromagnetic mismatch, which limits their further applications. In this paper, a series of 2D biochar-based flakes with different pore sizes were prepared by pyrolysis of cellulose from bamboo wood, followed by chemical etching, using waste bamboo as an example. The increase of the etching time directly affected the pore size of the material, which affected its dielectric properties. It was shown that the pores of biochar-based flakes (PGC-6) with macroporous structure obtained by 6 h of etching provided an ideal impedance match an enhanced po-larization effect, which made it an excellent electromagnetic wave absorber. The lowest RL value of PGC-6 is-15.8 dB, while the absorption bandwidth achieves 3.8 GHz at 1.70 mm. This study provides a viable pathway for the reuse of agroforestry waste.

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