Temperature-Robust Broadband Metamaterial Absorber via Semiconductor MOFs/Paraffin Hybridization

The demand for temperature-robust electromagnetic wave (EMW) absorption materials is escalating due to the varying operational temperatures of electronic devices, which can easily soar up to 100 °C, significantly affecting EMW interference management. Traditional absorbers face performance degradation across broad temperature ranges due to alterations in electronic mobility and material impedance. This study presented a novel approach by integrating semiconductor metal–organic frameworks (SC-MOFs) with paraffin wax (PW), leveraging the precise control of interlayer spacing in SC-MOFs for electron mobility regulation and the introduction of paraffin wax for temperature-inert electromagnetic properties. This synergistic strategy enhanced dielectric properties and impedance matching across temperature ranges from ambient to 100 °C. A metamaterial shell layer, designed through finite element simulation and fabricated by 3D printing, encapsulated the composite, resulting in a broadband metamaterial absorber with an 11.81 GHz effective absorption bandwidth and a nearly unchanged absorption peak position across 25–100 °C. This temperature-robust metamaterial absorber paves the way for advanced EMW management materials capable of operating reliably in extreme temperature environments.