Fe-doped SiCN composite fibers for electromagnetic waves absorption

Electrostatic spinning precursor fibers with presence of polysilazane and nano-Fe2O3 were herein derived by a thermally-induced polymerization at 1100 degrees C to prepare Fe-doped SiCN composite fibers. The phases and mi-crostructures were characterized and their influences on properties of permittivity, permeability and electromagnetic waves absorption properties were systematically investigated at 2-18 GHz. During thermal carbonization, the additions of gamma-Fe2O3 nanoparticles were in-situ reduced and transformed into core-shell structured Fe@Si3N4 particles, which were homogenously distributed in SiCN composite fibers. The RLmin of SiCN-Fe0.5 composite fibers reached-22.68 dB at 14.4 GHz with the thickness of 1.5 mm and showed a broad effective absorption bandwidth range (RL <-10 dB, 4.5 GHz, 13.54-17.04 GHz).

Automated summary

Fe-doped SiCN composite fibers were prepared through thermally-induced polymerization, with the microstructures playing a crucial role in the electromagnetic wave absorption properties. The results showed excellent absorption performance of the Fe-doped composite fibers.