Ultralight SiO₂ Nanofiber-Reinforced Graphene Aerogels for Multifunctional Electromagnetic Wave Absorber.

IF 8.3 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY ACS Applied Materials & Interfaces Pub Date : 2024-11-05 DOI:10.1021/acsami.4c16592

Haoyuan Tian, Jingpeng Lin, Jiurong Liu, Lei Li, Bin Li, Sinan Zheng, Wei Liu, Chang Liu, Zhihui Zeng, Na Wu

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Abstract

The high-efficiency utilization of two-dimensional (2D) graphene layers for developing durable multifunctional electromagnetic wave (EMW) absorbing aerogels is highly demanded yet remains challenging. Here, renewable, low-density, high-strength, and large-aspect-ratio ceramic silicon dioxide (SiO₂) nanofibers were efficiently prepared to assist in the preparation of ultralight yet robust, highly elastic, and hydrophobic graphene aerogels using facile, scalable freeze-drying followed by a carbonization approach. The ceramic nanofibers efficiently prevent the agglomeration of graphene and enhance interfacial interactions, significantly promoting mechanical strength. In addition to the high conduction loss capability derived from the interconnected graphene network, high interfacial polarization derived by abundant heterogeneous interfaces is accomplished for the three-dimensional (3D) hybrid aerogels. The hybrid aerogels thus showcase excellent EMW absorption performance, involving a minimum reflection loss of -74.5 dB at 1.8 mm and an effective absorption bandwidth of 5.7 GHz, comparable to those of the best EMW absorbers. Furthermore, the integration of one-dimensional SiO₂ and 2D graphene into 3D hybrid aerogels enables remarkable photothermal antibacterial, photothermal oil absorption, and thermal insulation performances. This work thus provides a type of ultralight ceramic/graphene aerogel with a high-efficiency utilization of graphene for accomplishing high-performance multifunctional applications.

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用于多功能电磁波吸收器的超轻二氧化硅纳米纤维增强石墨烯气凝胶。

高效利用二维（2D）石墨烯层来开发耐用的多功能电磁波（EMW）吸收气凝胶的要求很高，但仍然具有挑战性。在此，我们采用简便、可扩展的冷冻干燥和碳化方法，高效制备了可再生、低密度、高强度和大纵横比的陶瓷二氧化硅（SiO2）纳米纤维，以帮助制备超轻但坚固、高弹性和疏水的石墨烯气凝胶。陶瓷纳米纤维能有效防止石墨烯团聚并增强界面相互作用，从而显著提高机械强度。除了相互连接的石墨烯网络带来的高传导损耗能力外，三维（3D）混合气凝胶还通过丰富的异质界面实现了高界面极化。因此，混合气凝胶具有出色的电磁波吸收性能，在 1.8 毫米处的最小反射损耗为 -74.5 dB，有效吸收带宽为 5.7 GHz，可与最好的电磁波吸收体相媲美。此外，将一维二氧化硅和二维石墨烯整合到三维混合气凝胶中，可实现显著的光热抗菌、光热吸油和隔热性能。因此，这项工作提供了一种高效利用石墨烯的超轻陶瓷/石墨烯气凝胶，可实现高性能的多功能应用。

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来源期刊

ACS Applied Materials & Interfaces 工程技术-材料科学：综合

CiteScore

16.00

自引率

6.30%

发文量

4978

审稿时长

1.8 months

期刊介绍： ACS Applied Materials & Interfaces is a leading interdisciplinary journal that brings together chemists, engineers, physicists, and biologists to explore the development and utilization of newly-discovered materials and interfacial processes for specific applications. Our journal has experienced remarkable growth since its establishment in 2009, both in terms of the number of articles published and the impact of the research showcased. We are proud to foster a truly global community, with the majority of published articles originating from outside the United States, reflecting the rapid growth of applied research worldwide.