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[email protected] composites with varying MXene content (15, 45, 90 mg) were successfully synthesized via in-situ liquid-phase deposition, achieving uniform dispersion of ~100 nm alloy particles on MXene layers.
• Increasing MXene content enhances dielectric loss but reduces magnetic permeability, leading to improved attenuation constant yet degraded impedance matching.
• Optimal performance achieved with 90 mg MXene: minimum reflection loss of −46.9 dB at 1.1 mm thickness and maximum effective absorption bandwidth of 3.60 GHz at 1.0 mm thickness.
• The effective absorption bandwidth decreases by 50% (from 1.5 mm to 1 mm thickness) with increasing MXene addition, highlighting a trade-off between absorption intensity and bandwidth.