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.
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