Behavior of Ni in carbon nanotube nucleation
| Autor: | Masako Yudasaka, Rie Kikuchi, Susumu Yoshimura, Etsuro Ota, Yoshimasa Ohki |
|---|---|
| Rok vydání: | 1997 |
| Předmět: |
Materials science
Physics and Astronomy (miscellaneous) Nucleation chemistry.chemical_element Nanotechnology Carbon nanotube Chemical vapor deposition law.invention Condensed Matter::Materials Science Chemical engineering chemistry law Transmission electron microscopy Particle Particle size Graphite Carbon |
| Zdroj: | Applied Physics Letters. 70:1817-1818 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/1.118700 |
| Popis: | A nucleation model was proposed for a carbon nanotube enclosing a Ni bar which was grown by chemical vapor deposition (CVD) at 700 °C using round Ni particles. At an early stage of CVD, each round Ni particle with a diameter of about 30 nm is covered with graphite layers. The graphite-covered Ni particle is considered to be unstable because the graphite layers have a large curvature. This instability is thought to make the graphite-covered Ni particles transform into a Ni bar enclosed within a carbon nanotube. In order to verify this nucleation model, we show that the size of the round Ni particle is a decisive condition for carbon nanotube formation by CVD, and that an intermediate state of the transformation of the graphite-covered Ni particles to the carbon-nanotube-enclosed Ni bar was observed by transmission electron microscopy. |
| Databáze: | OpenAIRE |
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