内包碳化铁洋葱状富勒烯的合成和表征

自从Kr（ae）tschmer等发现宏观量制备富勒烯的方法以来，这种新型的球形碳质材料已经引起材料科学家愈来愈多的关注．特别是以洋葱状形态和包裹外来物质进入洋葱状富勒烯内部的碳质材料更是展现了这种新型碳材料的应用前景．

Synthesis and Characterization of Iron-included Onion-like Fullerenes

Iron-included Onion-like Fullerenes(OLFs) were formed by pyrolysis ferrocene and C2H2 in H2 and Ar streams through a cylindrical furnace with a temperature at 950 ℃ in their center. The resulting carbon structure morphology was influenced by different carrying gases. When proper hydrogen flow was used in the carring gas, the graphitic carbon on the surface of metal catalysts can be easily eached. This etching rate and the catalytic efficiency of metal are two competitive mechanisms in the graphitization processes, that is, when the etching rate of graphitic sheets dominates, iron-included OLFs are apparently the end product. XRD showed that the presenting metal particle is iron carbide. XRD patterns show that the presented metal particle is iron carbide. Raman scattering spectra show that the G peak of iron-included OLFs has slightly upshift from the position 1 582 cm-1(known for a pure graphite), which was interpreted as an influence of shell curvature. Hollow core OLFs can be obtained after the iron carbide particals were removed by annealing iron-included OLFs at 1 900 ℃ for 4 h.