【摘要】 以石墨粉为碳源,Al为催化剂,采用两步真空热处理法,进行洋葱状富勒烯(OLFs)的合成研究。用高分辨透射电子显微镜(HRTEM)、X射线衍射仪(XRD)对产物进行表征。结果表明:80 0℃真空热处理后,产物中存在大量石墨碎片、非晶碳球和金属微粒;1 80 0℃真空热处理后,产物中出现大量OLFs,且晶化程度很高,结构较完善,粒径较均匀(约1 5～35nm)。此外,探讨了OLFs的生成机理。更多还原

【Abstract】 The synthesis of onion-like fullerenes(OLFs) by two-step vacuum heat-treatment of pure graphite powders was investigated using Al as catalyst. High resolution transmission electron microscopy(HRTEM) and X-ray diffraction (XRD) analysis were used to characterize the morphologies and micro-structures of the products. Results indicate that lots of graphite pieces, amorphous spherical carbon and metal particles exist in sample after vacuum heat-treatment at 800℃.After vacuum heat-treatment at 1800℃, OLFs in sample are perfectly structured and highly graphitized, with external diameter between 15nm and 35nm. Moreover, the growth mechanism of OLFs and metal-encapsulating OLFs are also discussed.更多还原