Jia Xu , Xinyao Xu , Zheng Ma , Xiao Zhang , Feng Yan , Piaoping Yang , Chunling Zhu , Yujin Chen
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引用次数: 0
摘要
超薄、轻质的优异电磁波(EMW)吸收材料因其在解决电磁污染方面的潜力而受到越来越多的关注。将异质表面工程与固有的界面极化响应相结合,开发出的材料已证明具有更强的电磁波吸收能力,但人们对其内在机理还不甚了解。在此,我们构建了一种三维(3D)掺杂 N 的还原氧化石墨烯气凝胶,其中含有超小 Co 和 MnO 纳米颗粒之间丰富的异质界面(NrGO/Co-MnO 气凝胶),Co 和 MnO 颗粒直径为 6.0 纳米。这些三维 NrGO/Co-MnO 气凝胶产生的反射损耗为 -51.7 dB,有效吸收带宽为 4.08 GHz,远高于单相气凝胶。密度泛函理论计算和实验结果表明,Co/MnO 异质界面电荷再分布引起的强界面极化、缺陷诱导极化以及介电损耗和磁损耗之间的协同效应增强了三维气凝胶的电磁波吸收特性。这些发现为创造有效的电磁波材料提供了重要的见解和基础,并凸显了纳米材料异质表面工程的前景。
Heterointerface engineering of N-doped graphene aerogels anchored with ultra-small Co and MnO nanoparticles for excellent electromagnetic wave absorption
Ultra-thin and lightweight excellent electromagnetic wave (EMW) absorption materials have seen increased attention due to their potential to address electromagnetic pollution. Combining heterointerface engineering and an intrinsic interfacial polarization response has resulted in material development that has demonstrated improved EMW absorption capabilities, yet the underlying mechanisms are not well understood. Herein, we construct a three-dimensional (3D) N-doped reduced graphene oxide aerogel containing abundant heterointerfaces between ultrasmall Co and MnO nanoparticles (NrGO/Co–MnO aerogels), with Co and MnO particle diameters of ∼6.0 nm. These 3D NrGO/Co–MnO aerogels produce a reflection loss of −51.7 dB and an effective absorption bandwidth of 4.08 GHz, much higher than that of the single-phase aerogels. The density functional theory calculations and experimental results indicate that the strong interfacial polarization caused by the charge redistribution at Co/MnO heterointerfaces, defect-induced polarization, and the synergistic effect between dielectric and magnetic loss enhance the electromagnetic wave absorption property of the 3D aerogels. These findings provide important insights and a basis for creating effective EMW materials and highlight the promise of heterointerface engineering in nanomaterials.
期刊介绍:
The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.