Several features of the iron-included onion-like fullerenes

Iron-included onion-like fullerenes (OLFs) were produced by pyrolysis of ferrocene and C2H2 in hydrogen and argon. Scanning electron microscopy (SEM) and high-resolution transmission electron microscopy (HRTEM) show that the resulting materials consist of only iron-included OLFs without any nanotubes. The formation mechanism of iron-included OLFs was discussed briefly. Structure and composition of the products were characterized by XRD analysis, Raman scattering spectrum, thermogravimetric analysis (TGA) and heat treatment.