Electromagnetic wave absorption mechanism of Fe@C nanoparticles prepared by gaseous detonation

Abstract The electromagnetic(EM) wave absorption properties of carbon-based magnetic nanoparticles prepared by gaseous detonation and explosive detonantion are different. In present study, the influence of detonation temperature on EM wave absorption property of Fe@C nanoparticles was studied by heat treatment. The results demonstrated that heat treatment was an easy and effective way to improve the EM wave absorption property of Fe@C nanoparticles. The reflection loss (RL) value reduced significantly from -1.8 dB to -17.1 dB, and the effective absorption frequency was 7.1 GHz. The improvement of phase and degree of graphitization resulted in the change of electromagnetic parameters, which led to a better impedance matching. As a result, the EM wave absorption property of Fe@C nanoparticles was enchanced. Detonation temperature is a key factor on EM wave absorption property of Fe@C nanoparticles, and heat treatment is an easy and useful way to enhance the EM wave absorbing ability of gaseous detonation Fe@C nanoparticles.