磁性多孔<strong>rGO@Co/CoO</strong>复合材料的制备和吸波性能

doi:10.11901/1005.3093.2021.391

材料研究学报

2022, Vol. 36

Issue (5): 332-342 DOI: 10.11901/1005.3093.2021.391

研究论文

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磁性多孔rGO@Co/CoO复合材料的制备和吸波性能

刘佳良¹, 徐东卫¹, 陈平¹^,²(

)

^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.大连理工大学化工学院三束材料改性教育部重点实验室大连 116024

Preparation and Microwave Absorption Properties of Magnetic Porous rGO@Co/CoO Composites

LIU Jialiang¹, XU Dongwei¹, CHEN Ping¹^,²(

)

^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:

刘佳良, 徐东卫, 陈平. 磁性多孔rGO@Co/CoO复合材料的制备和吸波性能[J]. 材料研究学报, 2022, 36(5): 332-342.
Jialiang LIU, Dongwei XU, Ping CHEN. Preparation and Microwave Absorption Properties of Magnetic Porous rGO@Co/CoO Composites[J]. Chinese Journal of Materials Research, 2022, 36(5): 332-342.

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摘要:

使用氧化石墨烯和乙酰丙酮钴为原料,用溶剂热和高温煅烧法合成了一系列三维多孔rGO@Co/CoO纳米复合材料。采用X射线衍射(XRD)和X射线光电子能谱(XPS)表征了材料的晶体结构及元素组成,用拉曼光谱分析了材料内部的石墨化程度及结构缺陷,用扫描电镜(SEM)和透射电镜(TEM)观察和分析了材料的形貌及微观结构。结果表明,煅烧温度为350、500及650℃制备的产物分别为rGO@CoO复合材料、面心立方(fcc型)rGO@Co纳米复合材料以及双晶型(fcc和hcp型)rGO@Co纳米复合材料。填充量(质量分数)为10%时,S500的吸波性能最优异,RL_min值为-74.5 dB,对应的频率为13.9 GHz,匹配厚度为2.5 mm,有效吸收带宽为6.1 GHz(10.7~16.8 GHz)。这种材料优异的吸波性能,可归因于多种损耗机制共同作用和独特的三维孔隙结构。

关键词 ：复合材料, 三维石墨烯, 磁性纳米粒子, 吸波性能

Abstract：

Nanocomposites of reduced graphene oxide coated cobalt or cobalt oxide (rGO@Co/CoO) were synthesized by solvothermal and high-temperature calcination method with solutions of AA grade Co and graphene oxide as raw materials. The prepared products are characterized by means of XRD, Raman spectroscopy, XPS, SEM and TEM. Results show that three type of composites could be fabricated by calcination at 350, 500 and 650°C respectively, namely rGO@CoO of face-centered cubic (fcc) phase, rGO@Co of fcc phase, and rGO@Co of fcc and hcp two-phases. Among others, the fcc rGO@Co (S500) exhibits excellent electromagnetic wave absorption properties (the relevant property was measured on a hollow ring made of the paraffin filled with the composite): The hollow ring with a low mass filling ratio of 10% (mass fraction) fcc rGO@Co (S500) nanocomposite presents the minimum reflection loss (RL_min) and maximum effective absorption bandwidth (EAB), corresponding to the RL_min and EAB are -74.5 dB and 6.1 GHz, respectively for the hollow ring with a wall of 2.5 mm in thickness. We believed that the present approach may be an economic and green route for the controllable synthesis of porous functionalized graphene materials as microwave absorbers.

Key words： composite three-dimensional graphene magnetic nanoparticles electromagnetic wave absorption performance

收稿日期: 2021-07-02

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(2019J11CY007);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: 刘佳良,男,1996年生,硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2021.391 或 https://www.cjmr.org/CN/Y2022/V36/I5/332

图1 rGO@Co/CoO纳米复合材料的合成路线

图2 多孔磁性rGO@Co/CoO纳米复合材料的XRD谱

图3 rGO@Co的XPS全谱图、rGO@Co的Co 2p谱图、rGO@Co的C 1s谱图以及GO的C 1s谱图

图4 S350、S500、S650的拉曼光谱

图5 S500不同倍数下SEM照片和S500在不同倍数下TEM照片

图6 S350、S500以及S650的二维及三维反射率

表1 文献中吸波材料的吸波性能

图7 S350、S500、S650复合材料介电常数d及磁导率的实部和虚部

图8 介电损耗的正切和磁损耗的正切(tanδμ )

图9 Cole-Cole半圆(ε′对ε″)和1~18 GHz频率范围内的C0值

图10 复合材料S350、S500以及S650的阻抗匹配和衰减常数

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