高磁場により優れた電磁波吸収特性を持つCoxSeナノシート合成に成功（High Magnetic Field Enables Synthesis of Heterophase CoxSe Nanosheets with Exceptional Microwave Absorption）

2026-03-02 中国科学院（CAS）

Synthesis of heterophase Co_xSe nanosheets under high magnetic field: Modulation of composition, morphology, magnetism, and microwave absorption (Image by Khalifa)

＜関連情報＞

• https://english.cas.cn/newsroom/research-news/202603/t20260305_1151463.shtml
• https://www.sciencedirect.com/science/article/abs/pii/S1385894726015329

高磁場下での異相CoxSeナノシートの合成：組成、形態、磁性、マイクロ波吸収の変調 Synthesis of heterophase CoxSe nanosheets under high magnetic field: Modulation of composition, morphology, magnetism, and microwave absorption

Mahmoud A. Khalifa, Wei Ding, Chenghong Zhang, Kang Qiu , Zhou Wang, Wei Wang, Jialiang Luo, Guoxing Pan, Jifan Hu, Zhigao Sheng
Chemical Engineering Journal  Available online: 11 February 202
DOI:https://doi.org/10.1016/j.cej.2026.174073

Highlights

• Magneto-synthesis approach modulates the growth of Co_xSe nanosheets.
• High magnetic field (HMF) greatly impacts multiple properties of Co_xSe at once.
• Co_xSe exhibits a transition from paramagnetic at 0 T to ferromagnetic at 10 T.
• Co_xSe@HMF achieves microwave absorption performance tenfold more than at 0 T.
• Reflection loss increases from −6.3 dB at 0 T to −66.3 dB at 10 T in the C-band.

Abstract

The structural design and controllable synthesis of nano-functional materials remain central research themes in the materials science field. In this study, a novel magneto-synthetic approach is proposed to synthesize heterophase Co_xSe nanosheets. The utilization of a high magnetic field (HMF)-assisted synthesis significantly influences the composition, morphology, magnetic properties, dielectric constant, and microwave absorption of Co_xSe. Particularly, HMF of 10 T manipulates the elemental ratio in the Co_xSe product, decreasing the x value from 0.85 at 0 T to 0.5 at 10 T partially. Consequently, a Co_0.85Se/Co_0.5Se heterophase is produced under HMF assistance. Notably, HMF simultaneously modulates the lateral dimensions and thickness of Co_xSe nanosheets, expanding their size from the nanoscale to the microscale. Alongside compositional and morphological changes, the Co_xSe nanosheets exhibit a transition from paramagnetic to ferromagnetic behavior. Collectively, the microwave absorption performance of the Co_xSe@HMF has been greatly enhanced with an increase of reflection loss (RL_min) more than tenfold, from −6.3 dB at 0 T to −66.3 dB at 10 T in the C-band. These outstanding findings demonstrate the capability of HMF-assisted synthesis to regulate multiple structural and physical parameters of materials simultaneously, which holds great promise for multi-parameter engineering in broad functional material applications.