Dual-regulation Fabrication of Mo2C@Magnetic Nanosheets and Their Wave Absorption Properties

JIA Jingkai; DUAN Lvtong; ZHU Xinyue; YU Le; CUI Kaitao; ZHOU Jintang

doi:10.16490/j.cnki.issn.1001-3660.2026.12.017

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Surface Technology ›› 2026, Vol. 55 ›› Issue (12) : 233-244. DOI: 10.16490/j.cnki.issn.1001-3660.2026.12.017

Functional Surfaces and Technology

Dual-regulation Fabrication of Mo₂C@Magnetic Nanosheets and Their Wave Absorption Properties

JIA Jingkai^a, DUAN Lvtong^a*, ZHU Xinyue^b, YU Le^a, CUI Kaitao^a, ZHOU Jintang^a*

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Abstract

The rapid advancement of electromagnetic fields has fueled the widespread adoption of 5G networks, and electronic devices are increasingly evolving toward higher frequency and miniaturization. Electromagnetic field technologies have become deeply embedded in every facet of modern life. Electromagnetic waves are ubiquitous across modern technology from non-destructive testing to wireless communication networks and precision radar systems. While these innovations enhance daily convenience, they simultaneously pose significant risks to human health and the environment. Specifically, electromagnetic pollution emerges as a critical environmental threat, exacerbating disruptions to sensitive electronic devices and posing long-term health hazard.
Microwave absorption materials(MAMs) play a vital role in mitigating electromagnetic pollution by converting, attenuating and redirecting electromagnetic energy through engineered structural designs, and can not only reduce health risks associated with electromagnetic exposure but also safeguard the reliable operation of electronic devices. Conventional microwave absorption materials generally suffer from drawbacks such as narrow EAB coverage and single loss mechanism, making them difficult to meet the requirements of practical applications. Compared with traditional MAMs, novel MAMs based on transition metal carbides (TMCs) possess more favorable electromagnetic parameters, higher electrical conductivity, richer loss mechanisms and superior impedance matching characteristics, those advantages make them ideal candidates for next-generation MAMs. Against the backdrop of increasingly developing modern life, the demand for such materials exhibiting excellent and stable electromagnetic performance have been steadily increasing. Consequently, the development of high-performance MAMs is of great significance not only in daily life but also in crucial sectors including telecommunications, aerospace, and defense. Among transition metal carbides, molybdenum carbide (Mo₂C) stands out owing to its mixed ionic-covalent-metallic bonding, which endows it with both structural stability and exceptional electrical conductivity. This unique bonding is crucial for balancing dielectric loss and impedance matching in microwave absorption, enabling Mo₂C as a prominent research hotspot in materials science.
Here, an organic-inorganic self-assembly process is adopted to prepare Mo₂C through coordination between TMCs and dopamine molecules followed by high-temperature annealing. Transition metal carbides serve as the structural matrix. Through a combination of compositional regulation and temperature engineering, TMC particles with magnetic nanosheets are encapsulated, the magnetic loss mechanism is incorporated to further enhance the overall microwave loss performance of the composites. In this work, LDH-X-Y core-shell composite materials are successfully produced, where X represents the content of magnetic nanosheets and Y represents the annealing temperature. Systematic investigation into the influence of dual-regulation strategy on the microwave absorption ability of LDH demonstrates that under conditions of 900 ℃ annealing temperature and moderate magnetic nanosheets shell loading, the composites achieves optimal impedance matching characteristics. Notably, at an ultrathin thickness of merely 1.5 mm, it exhibits an effective absorption bandwidth(EAB) of 4.91 GHz with a minimum reflection loss (RL_min) of -34.58 dB. Additionally, the radar cross section (RCS) attenuation performance of the samples is simulated using CST studio suite software, LDH-2-900 significantly reduces RCS values compared with perfect electronic conductor (PEC), highlighting its superior electromagnetic interference suppression capability. This work provides a novel strategy to effectively expand loss pathways and boost loss capability, offering valuable insights into the fabrication of high-performance microwave absorption materials.

Key words

microwave absorption materials / transition metal carbides / conductive loss / polarization loss / magnetic loss / reflection loss / effective absorption bandwidth

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JIA Jingkai, DUAN Lvtong, ZHU Xinyue, YU Le, CUI Kaitao, ZHOU Jintang. Dual-regulation Fabrication of Mo₂C@Magnetic Nanosheets and Their Wave Absorption Properties[J]. Surface Technology. 2026, 55(12): 233-244

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