Nucleation stages of carbon nanotubes (CNTs) on a SiC(0001) Si-face (4° off toward [112̄0]) by surface decomposition are investigated by means of in-situ scanning tunneling microscopy (STM). After a relatively short heating time at 1600°C, moiré patterns and small nuclei appear on the surface due to the evaporation of Si atoms and, as a result of this, surface graphitization. Modelling of the moiré pattern indicates the formation of a single graphene sheet on top of the SiC surface. Local swelling (∼1 nm in diameter) of such a graphene sheet, possibly resulting from the compressive stress at the graphene/ SiC interface, gives rise to a CNT nucleus. In the stages that follow, the nucleus is continuously and unidirectionally prolonged and rolled-up, which may result in a final form such as a CNT.
|Journal||Japanese Journal of Applied Physics, Part 2: Letters|
|Publication status||Published - Jun 24 2005|
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)
- Physics and Astronomy(all)