Fe@Graphite nanocapsules with atomic-scale substitutional oxygen in graphitic shells for improving gigahertz dielectric losses and microwave absorption properties
Source abstract
Abstract
Abstract Dielectric losses could be tuned by controlling the compositions and specific structural units. Herein we demonstrate that the complex permittivity of Fe@Graphite nanocapsules at gigahertz can be effectively enhanced up to ∼150% by a simple annealing procedure. Experimental results reveal that it is originating from the intrinsic polarization of atomic-scale oxygen-carbon complexes, which is ascribed to the formation of the substitutional oxygen in highly defective graphitic layers. The present study opens up a new avenue for optimizing electromagnetic loss performances of materials and provides an insight to atomic-scale structural configuration of dielectric polarizations.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Electromagnetic wave absorption materials · Dielectric properties of ceramics · Magnetic Properties and Synthesis of Ferrites
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References (43)
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