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![](https://wqketang.oss-cn-beijing.aliyuncs.com/image/journal_prod/2024-08-02/f0e66600-7b55-405b-9561-0ef889f7911e.jpg?Expires=1725755556&OSSAccessKeyId=STS.NTb4DXU4JD36Bm7sCfLXpJ6m3&Signature=jt1kYoiDxY4ZI6Bfo%2FJtIfSXtoA%3D&security-token=CAISywJ1q6Ft5B2yfSjIr5fXf%2F7suOtr8%2FHdQEuGl0MzQNdcpfPG0Tz2IHtKenhsBOsbtfk1mG5W5%2FgZlqJ9SptIAEfJa9d99MznDrFDltCT1fau5Jko1beHewHKeTOZsebWZ%2BLmNqC%2FHt6md1HDkAJq3LL%2Bbk%2FMdle5MJqP%2B%2FUFB5ZtKWveVzddA8pMLQZPsdITMWCrVcygKRn3mGHdfiEK00he8TouufTinpHMskGA1Aell7Mvyt6vcsT%2BXa5FJ4xiVtq55utye5fa3TRYgxowr%2Fwo0v0YpGya5YzHXwcPskvdKZbo78UqLQlla6w%2BGqFJqvPxr%2Fp8t%2Fx5fWJKAezhVgs8cVM8JOjIqKOscIsi5g%2Fq6gWPcD1LXoQ6vH1ZZ5%2FAzVZaVWUEMpNqcRxTMldXaQqhSZT8m3upKXzOJeX7ls9%2Fv%2FV7p7UvocvUTzDnGoABCKEw5zeqVEFt1P1tLtZPWFgqoxMOwG7QFDd16KVAW84FGRPy%2BnneCrZe0HYm786BcWDP3XmPmuNohvQFG%2FYf9X49aXiJQs6eJFt93A5NT8dSRXVX3d0gsHp4aPRQxBXChZPaPyC91ZpQadlfhy79dcqC4544nSt5yl%2BptAu%2FCNkgAA%3D%3D)
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SiOC-based ceramics are considered promising electromagnetic wave-absorbing materials because of their lightweight, high-temperature resistance, and heat insulation properties. Herein, SiOC@C ceramic nanospheres were prepared using a liquid phase method combined with the polymer-derived ceramics (PDCs) method, followed by heat treatment in N2 and Ar atmospheres at different temperatures. The morphology, microstructure, phase composition, and electromagnetic wave absorption performance of the SiOC@C ceramic nanospheres were investigated in detail. The SiOC@C ceramic nanospheres obtained in the Ar atmosphere showed an RLmin of -67.03 dB; whereas the SiOC@C ceramic nanospheres obtained in the N2 atmosphere exhibited an RLmin value of -63.76 dB. The outstanding electromagnetic wave absorption performance of the SiOC@C ceramic nanospheres was attributed to the synergistic effect between conductive loss, interfacial/defect polarization loss, multiple reflections and scattering. Therefore, this research provides valuable insights into the design and fabrication of SiOC ceramic-based electromagnetic wave absorbers.
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The articles published in this open access journal are distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/).