多分叉和铁填充碳纳米管的合成与表征

摘要

Multi-branch carbon nanotubes (CNTs) have been synthesized by a chemical vapor deposition method using dicyclopentadiene and ferrocene as precursors.Iron nanoparticles are observed inside the CNTs around the junction points.The content of the filled Fe-species could be effectively regulated by adjusting the recipe and growth temperature.The results indicate that the more ferrocene is used,the more branches will be formed and the more Fe species will be filled inside the CNTs around the junctions,suggesting the important role of the Fe species in forming the branchy CNTs.The diameter of the branches becomes significantly smaller with the increase in number of branches for the corresponding mother tubes.%以二环戊二烯和二茂铁为前驱体,通过化学气相沉积法可控地制备了多分叉的碳纳米管,在其分叉处观察到铁填充物.通过调变前驱物的比例、生长温度等条件能够有效地调变填充物Fe的含量.结果表明,前驱体中二茂铁的相对含量越高,分叉和填充现象越明显,说明铁物种在分叉形成中起重要作用.随着分叉次数的增加,支管的直径显著减小.