One-Pot Synthesis of Doped-Polypyrrole/Fe3O4 Nanosphere Composites and Their Microwave Absorption Performance

Doped-polypyrrole/Fe(3)O(4) (D-PPy/Fe(3)O(4)) nanospheres were successfully synthesized via a onepot process. In this process, polyvinyl alcohol (PVA) plays an important role in the construction of polypyrrole nanoparticles, and Fe(3+) ions were the oxidant and the only raw resource of Fe(3)O(4). The morphology, magnetic properties, and electromagnetic microwave absorption properties of D-PPy/Fe(3)O(4) composites were characterized by transmission electron microscopy (TEM), X-ray diffraction (XRD), a vibrating sample magnetometer (VSM) and a vector network analyser (VNA). The results indicate that D-PPy/Fe(3)O(4) nanospheres become more disperse and regular due to the addition of PVA. The influence of the mass ratio of PVA to pyrrole on the microwave absorption performance of the D-PPy/Fe(3)O(4) composites was also investigated. When the mass ratio of PVA/pyrrole was 0.75:1, the minimum reflection loss (RLmin) value of the D-PPy/Fe(3)O(4) composites reached -41.3 dB at 7.7 GHz with a thickness of 3.0 mm. The microwave interference cancellation of interface reflection, nature resonance loss and current loss are the main reasons for the loss of electromagnetic microwaves for the as-prepared D-PPy/Fe(3)O(4) composites.