Manipulation of nano-metals to implement rational conduction tailoring for high-efficiency microwave absorption

Abstract

Conduction tailoring (CTs) of dielectric absorbers has already been regarded an effective strategy to realize the controllable electromagnetic (EM) wave response. However, there is still lacking of elaborate understanding of the relationship between the design of CTs and microscopic properties, as well as how they relate to EM wave absorption. Here, reduction graphene oxide-based CTs is developed by nano-metal intercalation into RGO lamella via additive-assisted vacuum filtration assembly technique and in-situ metal reduction technique. After the integration of micro-/macro-evolution of composition and structure, cross-scale analog computation, and EM patterns/power loss analysis, for the first time the implementing mechanisms of CTs on the improvement of EM wave absorption properties have been acquired. Benefiting from the balance between the energy capture and EM energy transformation, effective frequency bandwidth of 6.9 GHz at 2.2 mm and 5.2 GHz at 1.8 mm can be achieved after the CTs design by silver and copper. Meanwhile, the optimum RCS reduction values reach 2.29 dB m2 when the detection theta was set as 20°. This work systematically explores the CTs-based relation chains of charges-composition-models-EM patterns, which is of great importance for the optimization of effective operating bandwidth and reflection loss properties.