Solid solution strategy for bimetallic metal-polyphenolic networks deriving electromagnetic wave absorbers with regulated heterointerfaces

Abstract

Construction heterointerface of multicomponent hybrid materials is significant and effective to modulate their electromagnetic wave (EMW) absorption performances. Herein, MoS2 solid solution-carbon hybrids derived from FeCu metal-polyphenolic networks (MPNs) are constructed to investigate the effect of interface manipulation on electromagnetic response. MPNs deposition through bimetal ions exchange dominates the phase contents and interfaces of MoS2-based composite by tailoring Fe/Cu ratio. The effects of bimetallic ions exchange on micro-nano structures and morphologies, the relationship between heterointerfaces and absorption performances of these hybrids are investigated systematically. The Cu (Cu2+ and Cu) and Fe (Fe3+ and Fe2+) can intercalate in interlayers of MoS2 nanosheets and substitute the Mo vacancy, generating abundant point-face typed heterointerfaces. And the introduction of carbon can also form face-face typed heterointerfaces. Profiting from the heterointerfaces constructed by MoS2 solid solution and carbon, bimetallic MoS2 solid solution-carbon hybrids (BMSCHs) possess outstanding EMW absorption performances with ultrawide bandwidth. The optimized minimum reflection loss of samples can reach −46.85 dB and the effective absorption bandwidth covers 6.48 GHz at 2.7 mm. Thus, this work can provide significant guidance for the structural design of high-performance EMW absorber based solid solution strategy.