利用频率选择表面提高镀银生物多孔碳的微波吸收性能

刘毅; 秦静楠; 卢琳琳; 徐洁; 苏晓磊

doi:10.1007/s12613-022-2491-7

Volume 30 Issue 3

Mar. 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(3): 525-535

Yi Liu, Jingnan Qin, Linlin Lu, Jie Xu, and Xiaolei Su, Enhanced microwave absorption property of silver decorated biomass ordered porous carbon composite materials with frequency selective surface incorporation, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 525-535. https://doi.org/10.1007/s12613-022-2491-7

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Yi Liu, Jingnan Qin, Linlin Lu, Jie Xu, and Xiaolei Su, Enhanced microwave absorption property of silver decorated biomass ordered porous carbon composite materials with frequency selective surface incorporation, Int. J. Miner. Metall. Mater., 30(2023), No. 3, pp. 525-535. https://doi.org/10.1007/s12613-022-2491-7

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研究论文

利用频率选择表面提高镀银生物多孔碳的微波吸收性能

西安工程大学, 西安 710048, 中国

通讯作者:
刘毅 E-mail: yiliu1021@163.com

苏晓磊 E-mail: suxiaolei@xpu.edu.cn

文章亮点

(1) 系统研究了聚乙烯吡咯烷酮（PVP）对镀覆银颗粒微观形貌的影响规律。

(2) 揭示了颗粒形貌对镀银多孔碳（Ag@PC）材料介电和吸波性能的影响机理。

(3) 通过设计频率选择表面提高了Ag@PC的吸波性能。

中文摘要

多孔碳（PC）因其重量轻、比表面积大、表面缺陷多等特点，成为一种具有应用前景的吸波材料，然而电导率和石墨化程度低的缺点限制了其性能的提高。本研究利用杉木作为生物碳模板，采用一步水热合成法制备了镀银多孔碳（Ag@PC）材料，并对其物相组成、显微结构和电磁吸波性能进行了研究。结果表明，金属银被成功地从溶液中还原出来，并以Ag颗粒的形式均匀分布在多孔碳表面和孔洞内部。金属Ag的存在不仅提高了多孔碳的电导率，同时促进了无定型碳的石墨化过程。乙烯吡咯烷酮（PVP）的加入抑制了晶体的结晶形核的过程，起到了细化Ag颗粒粒径的作用。然而，由于形成了更连续的导电网络，未添加PVP的Ag@PC复合材料表现出更高的介电常数和更强的电磁波耗散能力。将Ag@PC与频率选择表面（FSS）复合后，其吸波性能得到了进一步的提高，在频段8.20–11.75 GHz范围内材料的反射损耗值低于−10 dB，反射损耗最小值达到了−22.5 dB。由此可见，利用金属Ag颗粒与FSS相结合是增强多孔碳材料电磁波吸收能力的有效途径。

关键词:

Research Article

Enhanced microwave absorption property of silver decorated biomass ordered porous carbon composite materials with frequency selective surface incorporation

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Abstract

Abstract

Porous carbon (PC) is a promising electromagnetic (EM) wave absorbing material thanks to its light weight, large specific surface area as well as good dissipating capacity. To further improve its microwave absorbing performance, silver coated porous carbon (Ag@PC) is synthesized by one-step hydro-thermal synthesis process making use of fir as a biomass formwork. Phase compositions, morphological structure, and microwave absorption capability of the Ag@PC has been explored. Research results show that the metallic Ag was successfully reduced and the particles are evenly distributed inward the pores of the carbon formwork, which accelerates graphitization process of the amorphous carbon. The Ag@PC composite without adding polyvinyl pyrrolidone (PVP) exhibits higher dielectric constant and better EM wave dissipating capability. This is because the larger particles of Ag give rise to higher electric conductivity. After combing with frequency selective surface (FSS), the EM wave absorbing performance is further improved and the frequency region below −10 dB is located in 8.20–11.75 GHz, and the minimal reflection loss value is −22.5 dB. This work indicates that incorporating metallic Ag particles and FSS provides a valid way to strengthen EM wave absorbing capacity of PC material.
- biomass carbon;
- Ag@PC composite material;
- frequency selective surface;
- electromagnetic wave absorbing property

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