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Defect Induced Polarization Loss in Multi‐Shelled Spinel Hollow Spheres for Electromagnetic Wave Absorption Application
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-08 , DOI: 10.1002/advs.202004640 Ming Qin 1 , Limin Zhang 1 , Xiaoru Zhao 1 , Hongjing Wu 1
Advanced Science ( IF 14.3 ) Pub Date : 2021-02-08 , DOI: 10.1002/advs.202004640 Ming Qin 1 , Limin Zhang 1 , Xiaoru Zhao 1 , Hongjing Wu 1
Affiliation
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Defect engineering is an effective approach to manipulate electromagnetic (EM) parameters and enhance absorption ability, but defect induced dielectric loss dominant mechanism has not been completely clarified. Here the defect induced dielectric loss dominant mechanism in virtue of multi‐shelled spinel hollow sphere for the first time is demonstrated. The unique but identical morphology design as well as suitable composition modulation for serial spinels can exclude the disturbance of EM wave dissipation from dipolar/interfacial polarization and conduction loss. In temperature‐regulated defect in NiCo2O4 serial materials, two kinds of defects, defect in spinel structure and oxygen vacancy are detected. Defect in spinel structure played more profound role on determining materials’ EM wave dissipation than that of oxygen vacancy. When evaluated serial Co‐based materials as absorbers, defect induced polarization loss is responsible for the superior absorption performance of NiCo2O4‐based material due to its more defect sites in spinel structure. It is discovered that electron spin resonance test may be adopted as a novel approach to directly probe EM wave absorption capacities of materials. This work not only provides a strategy to prepare lightweight, efficient EM wave absorber but also illustrates the importance of defect engineering on regulation of materials’ dielectric loss capacity.
中文翻译：
用于电磁波吸收应用的多壳尖晶石空心球中缺陷引起的极化损耗
缺陷工程是操纵电磁（EM）参数和增强吸收能力的有效方法，但缺陷引起的介电损耗的主导机制尚未完全阐明。这里首次证明了多壳尖晶石空心球的缺陷引起介电损耗的主导机制。独特但相同的形貌设计以及串行尖晶石合适的成分调制可以排除偶极/界面极化和传导损耗对电磁波耗散的干扰。在NiCo 2 O 4系列材料的温控缺陷中，检测到尖晶石结构缺陷和氧空位两种缺陷。尖晶石结构的缺陷对材料电磁波耗散的影响比氧空位的影响更为深远。当评估系列钴基材料作为吸收体时，由于尖晶石结构中有更多的缺陷位点，缺陷诱发极化损耗是NiCo 2 O 4基材料优异吸收性能的原因。研究发现电子自旋共振测试可作为直接探测材料电磁波吸收能力的新方法。这项工作不仅提供了制备轻质、高效电磁波吸收器的策略，而且说明了缺陷工程对调节材料介电损耗能力的重要性。
更新日期：2021-02-08
中文翻译：
用于电磁波吸收应用的多壳尖晶石空心球中缺陷引起的极化损耗
缺陷工程是操纵电磁（EM）参数和增强吸收能力的有效方法，但缺陷引起的介电损耗的主导机制尚未完全阐明。这里首次证明了多壳尖晶石空心球的缺陷引起介电损耗的主导机制。独特但相同的形貌设计以及串行尖晶石合适的成分调制可以排除偶极/界面极化和传导损耗对电磁波耗散的干扰。在NiCo 2 O 4系列材料的温控缺陷中，检测到尖晶石结构缺陷和氧空位两种缺陷。尖晶石结构的缺陷对材料电磁波耗散的影响比氧空位的影响更为深远。当评估系列钴基材料作为吸收体时，由于尖晶石结构中有更多的缺陷位点，缺陷诱发极化损耗是NiCo 2 O 4基材料优异吸收性能的原因。研究发现电子自旋共振测试可作为直接探测材料电磁波吸收能力的新方法。这项工作不仅提供了制备轻质、高效电磁波吸收器的策略，而且说明了缺陷工程对调节材料介电损耗能力的重要性。
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