CoFe/C heterostructured fiber composites derived from discarded cigarette filters for excellent microwave absorption

Exploiting the electromagnetic wave absorbers with high microwave absorption performance by establishing the heterostructure in the carbon-based materials is an exciting strategy to address the issue of electromagnetic pollution. CoFe or Co alloy is introduced into carbon-based absorbing materials to optimize the impedance matching and enhance the magnetic loss. Herein, CoFe/C heterostructured fiber composites are prepared from the discarded cigarette filters by the wet chemical immersion and subsequent calcination for high-quality light microwave absorbing materials. The CoFe/C fiber composites calcined at 950 °C temperature remarkably achieve a − 53.8 dB strong reflection loss value at 1.57 mm matching thickness and 5.3 GHz broad bandwidth. This work should provide an effective strategy for the utilization of discarded cigarette filters as high microwave absorption performance materials.