Single-Walled Carbon Nanotube Growth from Highly Activated Metal Nanoparticles
journal contributionposted on 13.12.2006 by Daisuke Takagi, Yoshikazu Homma, Hiroki Hibino, Satoru Suzuki, Yoshihiro Kobayashi
Any type of content formally published in an academic journal, usually following a peer-review process.
We demonstrate that any metal, even gold, silver, and copper, can act as a catalyst for SWCNT synthesis in chemical vapor deposition (CVD). Metal nanoparticles 3 nm or less in diameter, introduced into CVD ambience immediately after heat treatment at 800−950 °C in air, produce SWCNTs. The activation method is effective for copper and various noble metals as well as for iron-family elements. This implies that any metal particle may produce SWCNTs when its size becomes 1−3 nm. In other words, carbon atoms can form SWCNTs in a self-assembling fashion on nanoparticles without the specific functions of iron-family elements.