Electromagnetic functional urchin-like hollow carbon spheres carbonized by polyaniline micro/nanostructures containing fecl₃ as a precursor

Hollow, urchin-like carbon spheres with electromagnetic function were prepared by a carbonization process at 1200 °C under an argon atmosphere by using template-freesynthesized, urchin-like, hollow spheres of polyaniline containing FeCl₃ as the precursors. The resulting hollow, urchinlike carbon spheres not only have a high, conductivity at room, temperature (≈12.3 S cm^-1), but they also exhibit ferromagnetic properties. The high conductivity at room temperature results from, the graphite-like structure, whereas α-Fe or γFe₂O₃ nanoparticles produced by FeCl₃ during the carbonization at 1200 ° C are attributed to the ferromagnetic properties. Interestingly, the electromagnetic functional hollow urchin-like carbon, spheres could be used as a reversible dye adsorbent.