Optics and Photonics Society of Iran

In this paper, Fe₃O₄ nanoparticles were synthesized in poly vinyl pirolydine matrix using wet chemical method. Different size and morphology of these nanoparticles including cubic, spherical and amorphous were obtained by controlling the temperature and weight ratio of polymer. Size and morphology were characterized using XRD and SEM. Influence of size and morphology of Fe3O4 nanoparticles in microwave absorbing was surveyed by network analyzer in 8-12 frequency range (X band). The results shows that increment in the size of the nanoparticles to 45nm leads to reflection loss enhancement and over than that, the reflection loss was decreased for the size of 90nm. The results were also prove the morphology dependence of absorption property. Cubic nanoparticles shows the maximum reflection loss and absorption bandwidth at all samples.