Optimal particle distribution induced interfacial polarization in hollow double-shell composites for electromagnetic waves absorption performance

Tunable designs of polymorphic structured transition metal dichalcogenide (TMDC) demonstrate promis-ing applications in the field of electromagnetic wave absorption (EMW). However, it remains a technical challenge for achieving a balanced relationship between well-matched impedance characteristics and dielectric losses. Therefore, the co-modification strategies of polydopamine coating and wet impregna-tion are chosen to construct CoS2 magnetic double-shell microspheres with phase component modula-tion to achieve the optimized performance. Dopamine hydrochloride forms a coating on the surface of CoS2 microspheres by self-polymerization and forms a double-shell structure during the pyrolysis pro-cess. Then the different metal is doped to generate heterogeneous components in the process of heat treatment. The results show that the cobalt doped double-shell microspheres have an ultra-high electro-magnetic wave absorption absorption capacity with an effective absorption bandwidth of 5.04 GHz (1.98 mm) and a minimum reflection loss value of -48.90 dB. The double-shell layer structure and metal ion hybridization can improve the interfacial polarization and magnetic loss behavior, which provides an explicit inspiration for the development of transition metal dichalcogenide and even transition metal compounds with tunable absorption properties.(c) 2022 Elsevier Inc. All rights reserved.