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Carbonyl iron fibers synthesized at 300 °C exhibit a minimum RL of −58.1 dB and an effective absorption bandwidth of 5.66 GHz.

Currently, the electromagnetic (EM) wave absorbers usually suffer severe performance degradation when they work for a while due to the generated heat issue. Developing a high-performance EM absorber with flexibility and adjustability that can effectively absorb the EM energy and convert into thermal energy at elevated temperature is highly desired but still remains a significant challenge. Herein, we demonstrate S-doped hollow carbon nanospheres used as fillers to fabricate a flexible and controllable EM absorber toward this challenge. Owing to the insertion of S-based polar groups in the graphitization area of carbon spheres, this EM absorber exhibits outstanding electromagnetic wave absorption capability with elimination of X-band EM wave performance at a temperature range of 298−423 K. Almost 90% of the Xband EM wave can be dissipated at 373 K, while the effective absorption rate of 75% can still be achieved at 423 K.

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