论文部分内容阅读
以Fe/Al2O3作催化剂,采用化学气相沉积法在400℃下催化裂解乙炔合成了纳米碳材料,为了去除催化剂载体和残留的催化剂颗粒,进一步将产物在60℃下于36%的浓盐酸中回流48h,并通过扫描电子显微镜、高分辨透射电子显微镜和X射线衍射仪对产物进行了表征.结果表明:在400℃下合成了直径在15~50nm之间、石墨片层呈层状堆积结构的内包Fe3C的纳米洋葱状富勒烯.进一步将产物在1100℃下热处理2h,得到了具有完整清晰的石墨壳层结构的纳米洋葱状富勒烯.在此基础上,探讨了内包金属纳米洋葱状富勒烯的生长机制,认为此实验条件下内包金属纳米洋葱状富勒烯的生长遵循气-固生长机制.
Nanostructured carbon nanomaterials were synthesized by catalytic cracking of acetylene at 400 ° C by chemical vapor deposition using Fe / Al 2 O 3 as a catalyst. In order to remove the catalyst support and the remaining catalyst particles, the product was further refluxed in 36% concentrated hydrochloric acid at 60 ° C 48h, and characterized by scanning electron microscopy, high resolution transmission electron microscopy and X-ray diffractometry.The results showed that the graphite layer was layered at 15 ~ 50nm in diameter at 400 ℃ Nano-onion-like fullerene containing Fe3C was prepared.The nano-onion-type fullerenes with complete and clear graphite shell structure were obtained by further heat treatment at 1100 ℃ for 2h.On the basis of this, Fullerene growth mechanism, that under the experimental conditions, the metal-encapsulated nano onion-based fullerenes follow the gas-solid growth mechanism.