隔热疏水Co<sup>2+</sup>-单宁酸骨架修饰的rGO气凝胶吸波材料研究

doi:10.11896/cldb.24090224

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Abstract The design of multifunctional electromagnetic wave-absorbing materials with strong absorption capacity and wide absorption bandwidth is the trend of the next-generation communication technology. Reduced graphene oxide (rGO) aerogels have been widely used in electromagnetic wave-absorbing research due to the porous structure, low density and excellent conductive network. However, pure rGO aerogel shows the problem of impedance mismatching, which is usually used with other materials. Metal-polyphenol farmwork has the advantages of abundant sources, environmental friendliness, and low cost. It also has strong adhesion ability and abundant dipole polarization groups, which can increase the roughness of rGO and improve its electromagnetic wave absorption performance. In this work, Co²⁺-tannic acid (Co²⁺-TA) nanorods were assembled into rGO skeleton by in-situ growth and hydrothermal reduction, and then the porous structures were constructed by freeze-drying. The prepared rGO/Co²⁺-TA aerogels exhibit strong wave-absorbing properties, achieving a minimum reflection loss of -64.21 dB and an effective absorption bandwidth of 6.16 GHz at a filling ratio of only 8wt%. The excellent wave-absorption performance can be attributed to the multiple reflections and scattering of the porous structure, the moderate resistance loss of the rGO skeleton, and the interfacial polarization loss and dipole polarization loss of the Co²⁺-TA nanorods. In addition, the Co²⁺-TA nanorod-modified rGO aerogel showed low density (0.03 g/cm³), hydrophobicity (water contact angle: 139.4°), and thermal insulation (temperature difference of 64 ℃). This work provides ideas for the design and synthesis of multifunctional and efficient wave-absorbing materials.

Key words： rGO aerogel ultra-high microwave absorption heat insulation metal-polyphenol framework microwave absorption

Published: Online: 2025-10-27

CLC number:

TB34

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	Articles by authors
	MENG Lipeng
	CHENG Jinbo
	HUANG Haoran
	LI Hui
	LI Dong
	WANG Li
	WU Yuanpeng
	ZHAO Chunxia
	LAI Jingjuan

Cite this article:

MENG Lipeng,CHENG Jinbo,HUANG Haoran, et al. Heat-insulating and Hydrophobic Co²⁺-Tannic Acid Framework Decorated rGO Aerogel for Microwave Absorption[J]. Materials Reports, 2025, 39(20): 24090224-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24090224 OR https://www.mater-rep.com/EN/Y2025/V39/I20/24090224

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