MOFs-derived 3D flower-like Y2O3/C microspheres with efficient electromagnetic wave absorption properties
Y 2 O 3 has emerged as a promising material for electromagnetic wave (EMW) absorption due to its excellent dielectric properties . However, the inherent insulating nature and single loss mechanism limit its absorption performance. Research on the microstructure modulation and component regulation of Y 2 O 3 -based absorbers remains relatively unexplored. In this work, Y 2 O 3 /C composites with flower-like architectures were synthesized for the first time via a metal-organic framework (MOFs) templating method. The effects of pyrolysis temperature on the microstructure, phase composition, and EMW absorption performance of the Y 2 O 3 /C composites were systematically investigated. At a pyrolysis temperature of 800 °C, the flower-like Y 2 O 3 /C microsphere exhibited optimal EMW absorption performance. The minimum reflection loss (RL) of pristine Y 2 O 3 was only −4.75 dB, while the Y 2 O 3 /C composite achieved a minimum RL of −51.77 dB and a maximum effective absorption bandwidth of 4.32 GHz. Moreover, by simply adjusting the matching thickness, the optimal sample exhibited strong absorption (RL < −30 dB) over a wide frequency range of 4–18 GHz. The incorporation of carbon effectively neutralized the insulating nature of Y 2 O 3 , thereby optimizing the impedance matching . The synergistic effects of multiple loss mechanisms, including polarization loss, resistance loss, and interfacial polarization, facilitated substantial EMW attenuation . This study provides a promising strategy for the design and fabrication of high-performance rare-earth oxide EMW absorbers with tunable morphologies and properties.
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