中空碳/Fe3O4磁性量子点复合材料的制备及其吸波性能

doi:10.11901/1005.3093.2021.334

材料研究学报

2022, Vol. 36

Issue (1): 29-39 DOI: 10.11901/1005.3093.2021.334

研究论文

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中空碳/Fe₃O₄磁性量子点复合材料的制备及其吸波性能

陈冠震¹, 陈平¹^,²(

), 徐东卫¹, 闵卫星¹

^1.大连理工大学化工学院精细化工国家重点实验室大连 116024
^2.大连理工大学三束材料改性教育部重点实验室大连 116024

Preparation and Microwave Absorbtion Performance of Composite Hollow Carbon/Fe₃O₄ Magnetic Quantum Dots

CHEN Guanzhen¹, CHEN Ping¹^,²(

), XU Dongwei¹, MIN Weixing¹

^1.State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian 116024, China
^2.Key Laboratory of Materials Modification by Laser, Ion and Electron Beams of Ministry of Education, Dalian University of Technology, Dalian 116024, China

引用本文:

陈冠震, 陈平, 徐东卫, 闵卫星. 中空碳/Fe₃O₄磁性量子点复合材料的制备及其吸波性能[J]. 材料研究学报, 2022, 36(1): 29-39.
Guanzhen CHEN, Ping CHEN, Dongwei XU, Weixing MIN. Preparation and Microwave Absorbtion Performance of Composite Hollow Carbon/Fe₃O₄ Magnetic Quantum Dots[J]. Chinese Journal of Materials Research, 2022, 36(1): 29-39.

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摘要:

将二氧化硅作为模板，通过原位聚合-溶剂热-煅烧工艺合成中空碳/Fe₃O₄磁性量子点复合材料，通过改变硝酸铁的添加量即相对碳含量来调控复合材料的电磁参数从而调节其微波吸收性能。使用扫描电镜(SEM)、透射电镜(TEM)表征了材料的结构和形貌，用拉曼光谱表征了材料的内部结构缺陷和相对石墨化程度，使用X射线晶体衍射(XRD)、X射线光电子能谱(XPS)表征了材料的晶体结构和化学组成。结果表明，厚度为2.55 mm的材料具有7.06 GHz的最大有效吸收带宽(EAB)，最小反射损耗值(RL_min)可以达到-43 dB。这种材料优异的微波吸收性能，主要源自于其电磁匹配特性以及介电-磁损耗的协同作用。

关键词 ：复合材料, 微波吸收材料, 溶剂热反应, X波段, 中空结构

Abstract：

The composite of hollow carbon/Fe₃O₄ magnetic quantum dots (C/MQDs) was synthesized via in-situ polymerization-solvothermal-calcination process with silicon dioxide as the template. The morphology, crystallographic structure, chemical composition, intrinsic structural defects, relative graphitization degree and electromagnetic parameters of the prepared composite C/MQDs were characterized by means of SEM, TEM, Raman spectroscopy, XRD, XPS and Vector network analyzer (VNA) etc. It follows that electromagnetic parameters of the prepared C/MQDs could be adjusted by changing the addition amount of ferric nitrate so that to adjust its microwave absorption (MA) performance. In fact, a hollow ring made of the mixed composite and paraffin with 7 mm in outer diameter and 2.55 mm in thickness presented a maximum effective absorption bandwidth (EAB) of 7.06 GHz and a minimum reflection loss value (RL_min) of -43 dB. The excellent microwave absorption performance of the prepared composite is mainly derived from its electromagnetic matching characteristics and the synergistic effect of dielectric-magnetic loss.

Key words： composite microwave absorbing materials solvothermal X-band hollow structure

收稿日期: 2021-05-28

ZTFLH:

TB332

基金资助:兴辽英才创新领军人才项目(XLYC1802085);国家自然科学基金(51873109);大连市科技创新基金重大项目(2019J11-CY007);中央高校基本科研业务费资助项目(DUT20TD207);三束材料改性教育部重点实验室基金(KF2004)

作者简介: 陈冠震，男，1996年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.334 或 https://www.cjmr.org/CN/Y2022/V36/I1/29

图1 C/MQDs复合材料的制备流程

图2 H-C、H-C@Fe-G以及C/MQDs-2的XRD谱

图3 H-C和C/MQDs-x的拉曼光谱

图4 C/MQDs-x的室温磁滞回线

图5 C/MQDs-2的XPS 全谱图、Fe 2p分峰图、C 1s分峰图以及O 1s分峰图

图6 H-C, H-C@Fe-G和C/MQDs-2复合材料的扫描电镜照片

图7 C/MQDs复合材料大的透射电镜照片和能量转换色谱

图8 C/MQDs-1、C/MQDs-2和C/MQDs-3的厚度、频率和反射损耗绘制的等高线图，以及厚度变化对应的反射损耗曲线(质量分数为15%，混合于石蜡)

图9 不同种类C/Fe3O4复合材料在特定厚度下的最小RL值和RLmin处对应的EAB

图10 C/MQDs-x的ε′, ε″, tanδε以及Cole-Cole半环

图11 C/MQDs-1、C/MQDs-2和C/MQDs-3的复磁导率常数的μ′、μ″、tanδμ以及涡流损耗曲线

图12 衰减常数、在1~18 GHz频率范围内厚度为2.35 mm的各种样品Zin-1的模量、匹配厚度(tm)和计算厚度对1/4波长处匹配频率(fm)的依赖性

图13 C/MQDs复合材料的吸波机理

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