摘要
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.
Iron-included Onion-like Fullerenes(OLFs) were formed by pyrolysis ferrocene and C_2H_2 in H_2 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.
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2005年第7期1222-1224,M009,共4页
Chemical Journal of Chinese Universities
基金
国家重大基础研究计划"九七三"项目(批准号:2004CB217808)
国家自然科学基金(批准号:90306014
20271037
20471041)资助
