Ramie plant-derived low-cost multi-phase HPCFs@n-MoSe₂ (n = 2H, 2H/1T and 1T) multilayered flower-like structures for wideband electromagnetic wave absorption applications

Herein, an inimitable low-cost phase assembly modulation/phase engineering strategy was used to synthesize multi-phase HPCFs@n-MoSe₂ (n = 2H, 2H/1T and 1T) with multilayered flower-like structures as electromagnetic absorbers (EMA). The influence of 2H, 2H/1T and 1T phases on electromagnetic wave (EMW) absorption performance was investigated by comparing their high-end reflection loss (RL) and high efficiency absorbing bandwidth (EAB, RL ≤ −10.00 dB). For instance, HPCFs@2H–MoSe₂ with 32.5 % filler loading exhibits −58.45 dB RL at 14.80 GHz over 2.30 mm matching thickness and EAB of 5.80 GHz. HPCFs@2H/1T-MoSe₂ at filler loading of 35.0 % gained high intensity RL of −60.76 dB RL at 8.50 GHz with 3.60 mm matching thickness and the EAB of 3.70 GHz. The EAB was further ameliorated to 5.50 GHz at a matching thickness of 2.50 mm. HPCFs@1T-MoSe₂ of 35.0 % filler loading exhibits −57.54 dB RL at 10.60 GHz and 3.10 mm matching thickness with EAB of 5.40 GHz. The EAB value was further improved to 6.30 GHz at 2.50 mm. The improved EMW absorption properties of EMA corresponded to numerous unsaturated defects, interface polarization centers, structural cavities, conduction loss, attenuation loss, dielectric relaxation, among others. This study provided a smart strategy to synthesize low-cost, highly efficient EMA.