Surface energy induced microstructural engineering of bio-derived N-doped carbon fibers anchored by CoNi nanoparticles for superior microwave absorption

IF 23.2 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Ying Li, Zhenxin Liu, Yuhao Lu, Minglong Yang, Peng Zhang, Dongyi Lei, Chengkan Liu, Sijia Wang, Chunlei Dong
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Abstract

Microstructural engineering has been an effective way to modulate the performance of electromagnetic wave absorption (EMA) materials. However, there are still severe challenges in how to design and regulate the microstructure effectively and further elucidate its mechanisms. Here, three-dimensional (3D) bio-derived N-doped carbon fibers anchored by CoNi nanoparticles (N-Cf@CoNi) nanocomposites were successfully prepared using biomass cotton and ZIF-67 precursor as raw materials by a two-step impregnation-carbonization method. By ingeniously adjusting the mass ratio of the ZIF-67 precursor, the surface morphology of balsam pear-like fiber was induced by crystal surface energy to achieve a transition from a “nanotube-assembled nest-like” structures to “rice-shaped nanosheets” to “nanoparticles.” The unique microstructural engineering strategy endows the N-Cf@CoNi nanocomposites with an abundant conductive network, enhanced multiple reflection and absorption, polarization, and magnetic loss, thereby leading to distinguished EMA performance, especially ultrawide EAB values. The optimized N-Cf@CoNi nanocomposites display a minimum reflection loss (RLmin) of − 59.43dB and an effective absorption bandwidth (EAB) of 8.5 GHz at a matching thickness of 2.16 mm. The result underscores the potential of microstructural engineering induced by crystal surface energy in optimizing the microwave absorption of N-Cf@CoNi nanocomposites, laying the foundation for the development of efficient EMA materials with controllable micro-morphology.

具有优异微波吸收性能的生物源掺n碳纤维的表面能诱导微结构工程
微结构工程已成为调制电磁波吸收材料性能的有效途径。然而,如何有效地设计和调控其微观结构,并进一步阐明其机理,仍然是一个严峻的挑战。本文以生物质棉和ZIF-67前驱体为原料,采用两步浸渍-碳化法制备了三维(3D)生物源掺n碳纤维(N-Cf@CoNi)纳米复合材料。通过巧妙地调整ZIF-67前体的质量比,晶体表面能诱导苦瓜状纤维的表面形态,实现了从“纳米管组装的巢状”结构到“米状纳米片”再到“纳米颗粒”的转变。独特的微结构工程策略赋予N-Cf@CoNi纳米复合材料丰富的导电网络,增强的多次反射和吸收、极化和磁损耗,从而获得卓越的EMA性能,特别是超宽EAB值。优化后的N-Cf@CoNi纳米复合材料在匹配厚度为2.16 mm时,最小反射损耗(RLmin)为−59.43dB,有效吸收带宽(EAB)为8.5 GHz。研究结果强调了晶体表面能诱导的微结构工程在优化N-Cf@CoNi纳米复合材料微波吸收方面的潜力,为开发具有可控微观形貌的高效EMA材料奠定了基础。
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来源期刊
CiteScore
26.00
自引率
21.40%
发文量
185
期刊介绍: Advanced Composites and Hybrid Materials is a leading international journal that promotes interdisciplinary collaboration among materials scientists, engineers, chemists, biologists, and physicists working on composites, including nanocomposites. Our aim is to facilitate rapid scientific communication in this field. The journal publishes high-quality research on various aspects of composite materials, including materials design, surface and interface science/engineering, manufacturing, structure control, property design, device fabrication, and other applications. We also welcome simulation and modeling studies that are relevant to composites. Additionally, papers focusing on the relationship between fillers and the matrix are of particular interest. Our scope includes polymer, metal, and ceramic matrices, with a special emphasis on reviews and meta-analyses related to materials selection. We cover a wide range of topics, including transport properties, strategies for controlling interfaces and composition distribution, bottom-up assembly of nanocomposites, highly porous and high-density composites, electronic structure design, materials synergisms, and thermoelectric materials. Advanced Composites and Hybrid Materials follows a rigorous single-blind peer-review process to ensure the quality and integrity of the published work.
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