材料科学
电子
极化(电化学)
电磁辐射
电介质
反射损耗
原子物理学
原子轨道
分子物理学
光电子学
光学
物理
物理化学
量子力学
复合数
复合材料
化学
作者
Wei Wang,Ke Yang,Da Li,Hu Liu,Shengchong Hui,Yuying Jiang,Yukui Zhang,Yiming Li,Yang Wang,Hongjing Wu,Yanglong Hou
标识
DOI:10.1002/adma.202314233
摘要
Abstract The electron migration polarization is considered as a promising approach to optimize electromagnetic waves (EMW) dissipation. However, it is still difficult to realize well‐controlled electron migration and elucidate the related EMW loss mechanisms for current researches. Herein, a novel Fe x N@NGC/Ce system to construct an effective electron migration model based on the electron leaps among the 4 f /5 d /6 s orbitals of Ce ions is explored. In Fe 4 N@NGC/Ce SA+Cs+NPs , Ce single‐atoms (SA) mainly represent a +3 valence state, which can feed the electrons to Ce 4+ of clusters (Cs) and CeO 2 nanoparticles (NPs) through a conductive network under EMW, leading to the electron migration polarization. Such electron migration loss combined with excellent magnetic loss provided by Fe 4 N core, results in the optimal EMW attenuation performance with a minimum reflection loss exceeds −85.1 dB and a broadened absorption bandwidth up to 7.5 GHz at 1.5 mm. This study clarifies the in‐depth relationship between electron migration polarization and EMW dissipation, providing profound insights into developing well‐coordinated magnetic–dielectric nanocomposites for EMW absorption engineering.
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