Heterointerface engineering of N-doped graphene aerogels anchored with ultra-small Co and MnO nanoparticles for excellent electromagnetic wave absorption
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
Abstract
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.