Graphene/Polyimide Composite Aerogels for Superior Electromagnetic-Wave-Absorbing Materials with High Thermal Stability and Absorption Effectiveness

被引：5
作者：
Li, Jinhuan [1 ]
Huang, Mengqi [1 ]
Gao, Wentao [1 ]
Yao, Kai [1 ]
Ma, Hongfang [1 ]
机构：
[1] Nanjing Univ Aeronaut & Astronaut, Coll Mat Sci & Technol, Nanjing 210016, Peoples R China
来源：
ACS APPLIED POLYMER MATERIALS | 2024年 / 6卷 / 10期
关键词：
graphene; polyimide; composite aerogel; thermal stability; electromagnetic wave absorption; MICROWAVE-ABSORPTION; GRAPHENE OXIDE; PERFORMANCE;
D O I：
10.1021/acsapm.4c00306
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
Graphene/polyimide composite aerogels (GPIs) were fabricated through a one-pot solvothermal method and then underwent heat treatment at 350 degrees C to obtain GPIs (350). GPIs (350) exhibits prominent electromagnetic-wave-absorbing properties. Specifically, the minimum reflection loss can reach -75.90 dB with a thickness of 3.75 mm, and the effective absorption bandwidth reaches 6.44 GHz with a thickness of 2.70 mm. The actual dosage of graphene oxide in the GPIs (350) absorbers is low to 3 wt %, showing high effectiveness in absorbing electromagnetic waves. Notably, GPIs (350) also displays excellent thermal stability up to 415 degrees C. Polyimide is proven to tune the electromagnetic properties and provide much graphene-polyimide interface. The composition of graphene and polyimide, the three-dimensional morphology, and post-heat treatment are the perfect match to guarantee excellent comprehensive electromagnetic wave absorption properties. The present work provides a much more facile and effective approach to fabricating electromagnetic-wave-absorbing materials with exceptional properties through tuning engineering polymers.
引用
收藏
页码：5662 / 5673
页数：12
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