插层诱导VSe2相变及其电磁性能调控

doi:10.15541/jim20260286

摘要/Abstract

摘要： 随着电子信息技术与无线通信技术的迅猛发展,电磁污染问题日趋严峻,这对高性能电磁波吸收材料的研发提出了迫切需求。微观结构调控是提升吸波材料电磁响应性能的核心途径。本研究提出一种化学插层诱导相变的新型结构调控策略,通过引入Fe、Co、Ni等金属原子对层状过渡金属硫族化合物VSe₂进行插层改性,诱导材料发生层间结构重构与局部晶格重排,实现电磁性能的调控和优化。结果表明,在低插层剂量下,插层产物能够维持VSe₂原有的晶体结构;在高插层剂量下,由于Fe、Co、Ni与Se元素具有强亲和性,导致VSe₂八面体结构单元发生扭曲,形成以VSe₂为晶格模板的第二相M_0.5VSe₂ (M=Fe、Co、Ni)。进一步研究表明,金属插层能够有效调节材料的电子结构与界面特征。随着插层比例的增加,材料的阻抗匹配特性逐步改善,同时材料的极化损耗增强,介电损耗能力得到提升。当形成稳定的M_0.5VSe₂ (M=Fe、Co、Ni)相结构时,材料在较薄厚度下均表现出优异的电磁波吸收性能。其中,Co插层产物Co_0.5VSe₂在8.2~12.4 GHz频段的吸波性能相比于VSe₂获得了明显提升;当样品厚度为1.68 mm时,最大有效吸收带宽达到2.84 GHz;当厚度为1.84 mm时,最小反射损耗达到-60.10 dB（9.45 GHz处）。本研究证实了插层诱导相变策略在层状材料电磁性能优化中的有效性,为层状过渡金属硫族化合物的结构设计与吸波性能提升提供了新思路与实验依据。

关键词: 二硒化钒(VSe₂), 金属插层, 相变调控, 电磁性能, 电磁波吸收性能

Abstract: With the rapid development of electronic information technology and wireless communication, electromagnetic pollution has become increasingly severe, creating an urgent need for high-performance electromagnetic wave absorbing materials. Microstructure regulation is a key approach to enhancing the electromagnetic response performance of absorbers. In this study, a novel structural regulation strategy based on chemical intercalation-induced phase transition was proposed. By intercalating layered transition metal dichalcogenide VSe₂ with metal atoms such as Fe, Co, and Ni, interlayer structural reconstruction and local lattice rearrangement were induced, thereby achieving tunable and optimized electromagnetic properties. The results show that at low intercalation doses, the intercalation products retain the original crystal structure of VSe₂; at high intercalation doses, however, the strong affinity between Fe, Co, Ni and Se causes distortion of the octahedral structural units in VSe₂, leading to the formation of a secondary phase M_0.5VSe₂ (M = Fe, Co, Ni) using VSe₂ as the lattice template. Further studies have revealed that metal intercalation can effectively modulate the electronic structure and interfacial characteristics of the material. With increasing intercalation ratio, the impedance matching characteristics of the material are progressively improved, while the polarization loss is enhanced and the dielectric loss capability is elevated. When a stable M_0.5VSe₂ (M = Fe, Co, Ni) phase structure is formed, the material exhibits excellent electromagnetic wave absorption performance even at relatively thin thicknesses. For instance, the Co-intercalated reaction product Co_0.5VSe₂ shows significantly improved absorption performance in the 8.2-12.4 GHz frequency range compared with VSe₂, achieving a maximum effective absorption bandwidth of 2.84 GHz at a sample thickness of 1.68 mm, and a minimum reflection loss of -60.10 dB (at 9.45 GHz) at a thickness of 1.84 mm. This study confirms the effectiveness of the intercalation-induced phase transition strategy in optimizing the electromagnetic properties of layered materials, and provides new insights and experimental evidence for the structural design and absorption performance enhancement of layered transition metal dichalcogenides.

Key words: vanadium diselenide (VSe₂), metal intercalation, phase transition regulation, electromagnetic property, electromagnetic wave absorption performance

中图分类号:

TQ174

李勉, 楚刘帅, 徐烨菲, 黄庆. 插层诱导VSe₂相变及其电磁性能调控[J]. 无机材料学报, DOI: 10.15541/jim20260286.

LI Mian, CHU Liushuai, XU Yefei, HUANG Qing. Intercalation-induced Phase Transition of VSe₂ and Its Electromagnetic Property Modulation[J]. Journal of Inorganic Materials, DOI: 10.15541/jim20260286.

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插层诱导VSe₂相变及其电磁性能调控

Intercalation-induced Phase Transition of VSe₂ and Its Electromagnetic Property Modulation

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