Effects of degree of graphitization of C shells on microwave absorption of Fe-C core-shell nanoparticles with excellent comparability  

作　　者：Daitao Kuang Yonghua Tian Weijie Duan Zhikun Tian Xiaogang Sun Shiliang Wang 

机构地区：[1]School of Computational Science and Electronics,Hunan Institute of Engineering,Xiangtan 411104,China [2]School of Physics and Electronics,Central South University,Changsha 410083,China [3]College of Mechanical Engineering,Hunan Institute of Engineering,Xiangtan 411104,China

出　　处：《Journal of Materials Science & Technology》2024年第12期1-8,共8页材料科学技术（英文版）

基　　金：Hunan Provincial Natural Science Foundation of China(Nos.2022JJ40121,2021JJ40153 and 2021JJ50108);Scientific Research Fund of Hunan Provincial Education Department(Nos.21B0657,22A0518).

摘　　要：In this study,Fe-C core-shell nanoparticles with identical metal core sizes and C shell thicknesses but varying degrees of graphitization of C shells were fabricated using metal-organic chemical vapor depo-sition and subsequent annealing.Due to the identical metal core,these nanoparticles exhibite a similar permeability,but significantly varying permittivity depending on how much C shells have been graphi-tized.It was discovered that proper graphitization of Fe-C nanoparticles annealed at 1350 ℃ can pro-duce excellent microwave absorption(MA),decent dielectric loss tangent in high frequency region,and moderately strong dielectric loss and attenuation properties.Furthermore,the threshold value of 1/ω is discovered to be a crucial parameter in the theoretical analysis of nonlinear behavior of polarization loss,and thus MA performance of the nanoparticles.This research offers a useful method for creating metal-C nanoparticles with various levels of C shell graphitization.It also provides a clear answer to the crucial question of how the level of C shell graphitization affects the MA performance of metal-C nanoparticles.These results may serve as a reference for the development and mechanism analysis of highly effective metal-C based absorbers.

关 键 词：FE-C C shell Graphitization degree Microwave absorption 

分 类 号：TQ127.11[化学工程—无机化工]