【摘要】 采用金属Cu,Al微粒 石墨混合材料,用直流电弧放电方法制备了洋葱状富勒烯。对两种产物进行了XRD、SEM、HRTEM和Raman结构表征。结果表明:两种纳米金属微粒均可催化得到洋葱状富勒烯;所得产物中有单纯洋葱状富勒烯和内包纳米金属微粒洋葱状富勒烯,且石墨化程度都很高;纳米金属微粒尺寸大小不同决定洋葱状富勒烯的直径分布不均匀,从而造成其拉曼谱峰相对于石墨特征峰1582cm-1发生了频移;用汽 液 固(VLS)生长模型描述了洋葱状富勒烯生长机理,解释了汽态碳原子通过在液态催化剂中扩散和析出,逐渐长大成形的现象。更多还原

【Abstract】 Onion-like Fullerenes (OFs) were synthesized by an arc-discharge technique, with different metal nanoparticles as catalysts. The microstructure of the products was characterized and analysed by XRD, SEM, HRTEM and Raman spectroscopy. Results indicated that two kinds of OFs can be prepared in the presence of metal nanoparticle catalysts: 1) individual OFs and 2) OFs encapsulating metal nanoparticles. The structure of OFs with a high degree of graphitization were shown to be similar to graphite. The diameters of OFs were unevenly distributed because of the (effect) of the size of the metal nanoparticles, which caused Raman spectra showing a frequency shift. A vapour-liquid-solid growth model was used to explain some experimental phenomena during OF formation.更多还原