Effective electromagnetic wave absorption and photoluminescence performances of flexible SiC nanowires membrane

The flexible SiC nanowires (SiC NWs) membrane was prepared by electrostatic spinning technique and pyrolysis using polycarbosilane (PCS) as a precursor. The NW consisted of 3C-SiC nanograins, turbostratic graphite, and amorphous SiaCy. The microstructure and phase composition of the NW were fine-tuned by controlling the pyrolysis temperature. The photoluminescence of the SiC NW membrane exhibited an evident blue shift, demonstrating its potential for latent application in optoelectronic devices. Additionally, the dielectric loss and electromagnetic wave (EMW) absorption of the nanowire membrane were analyzed between 2 and 18 GHz. An ultra-low content of only 10 wt% SiC NW membrane in the paraffin matrix resulted in excellent dielectric loss, with optimal reflection loss of -41 dB and an effective absorption bandwidth (EBA) of 5 GHz with a 1.5-mmthick membrane. Herein, the electromagnetic absorption mechanism of a sheet-like, flexible SiC NW membrane in a paraffin matrix is proposed. The unique microstructure of the flexible SiC NW membrane provides excellent light-emitting and EMW absorption performance, enabling it to act as a satisfactory lightweight EMW absorber and optoelectronic device in harsh environments.