Honeycomb-like bamboo powders-derived porous carbon with low filler loading, high-performance microwave absorption

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL

Carbon Pub Date : 2023-11-01 DOI:10.1016/j.carbon.2023.118415

Zhihong Wu , Jijin Chang , Xinyu Guo , Dan Niu , Anwen Ren , Peng Li , Huafeng Zhou

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引用次数: 0

Abstract

Nowadays, the problem posed by electromagnetic wave pollution to electronic devices and biological systems is of serious concern. To create a microwave absorber, component and structural modulation is crucial. Biomass-derived porous carbon is a potential material for microwave absorption applications due to the characteristics of lightweight, high specific surface area, and significant dielectric loss. In this study, by examining the impact of various KOH concentrations on the pore structure, bamboo powders with an 80-mesh size were used as a raw material to create honeycomb-like bamboo powders-derived porous carbon (BPDPC) materials. The activation mechanism of the BPDPC material is also explained. Based on the electromagnetic parameters, the sample BPDPC-4 impregnated with 4 mol/L KOH has a maximum effective absorption bandwidth (RL ≤ −10 dB) of 4.76 GHz at a matching thickness of 2.0 mm, covering 11.54–16.30 GHz and a minimum reflection loss (RL_min) of −40.99 dB at a matching thickness of 2.2 mm at 5 wt% ultra-low filler loading. Due to polarization loss, conduction loss, and the mutually beneficial effects of multiple electromagnetic wave reflection and scattering, the superior wave absorption performance is explained. This work also serves as a reference for investigating porous carbon generated from biomass.

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蜂窝状竹粉衍生多孔碳，低填料负荷量，高性能微波吸收

目前，电磁波对电子设备和生物系统的污染问题已引起人们的严重关注。为了制造一个微波吸收器，元件和结构调制是至关重要的。生物质衍生多孔碳具有重量轻、比表面积高、介质损耗大等特点，是微波吸收材料的潜在应用领域。本研究通过考察不同KOH浓度对孔隙结构的影响，以80目大小的竹粉为原料，制备了蜂窝状竹粉衍生多孔碳(BPDPC)材料。并对BPDPC材料的活化机理进行了解释。基于电磁参数分析，在4 mol/L KOH浸渍的BPDPC-4样品中，在匹配厚度为2.0 mm时，最大有效吸收带宽(RL≤- 10 dB)为4.76 GHz，覆盖范围为11.54 ~ 16.30 GHz，在匹配厚度为2.2 mm时，最小反射损耗(RLmin)为- 40.99 dB。由于极化损耗、传导损耗以及多重电磁波反射和散射的相互作用，解释了优越的吸波性能。这项工作也为研究生物质产生的多孔碳提供了参考。

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

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.