A microwave-absorbing property of super-paramagnetic zinc-nickel ferrite nanoparticles in the frequency range of 8-12 GHz

摘要

Microwave-absorbing samples were fabricated using carbon black powder, super-paramagnetic Zn0.8Ni0.2Fe2O4 nanoparticles dispersed in a SiO2 matrix, epoxy resin, and hardener. The paint was then coated onto a steel substrate. The effects of super-paramagnetic Zn0.8Ni0.2Fe2O4 nanoparticles content (0-1.75 wt%) and different coating thickness (1-2.5 mm) on microwave absorption ability in the X-band frequency range (8-12 GHz) have been studied. The results showed that paint sample containing only carbon black (20 wt%) and epoxy resin (80 wt%) expressed low microwave absorption ability at 10 GHz centered frequency (approximate to 67% absorption percentage). The super-paramagnetic Zn0.8Ni0.2Fe2O4 nanoparticles strongly affected the microwave-absorbing ability. A sample of 1.5 wt% super-paramagnetic Zn0.8Ni0.2Fe2O4 nanoparticles content exhibited highest microwave absorption at 10 GHz centered frequency (approximate to 99% power attenuation). Higher coating thicknesses (1-2.5 mm) led to greater microwave absorption and reached a very high absorption of 2 mm thickness (approximate to 99% absorption percentage at 10 GHz centered frequency).