STM observation of formation process of carbon nanotube from 6H-SiC (000-1)

Abstract

Formation process of nanosized cap structures on a thermally treated 6H-SiC(000-1) substrate was investigated using atomic-resolution ultrahigh-vacuum scanning tunneling microscopy (UHV-STM). After formation of clusters of carobon particles 1-2 nanometer in diameter at 1150°C, these nanoparticles merged, forming nanosized cap structures. Hexagonal carbon networks, partly composed of pentagons, were clearly observed on the surface of the cap structures for a sample annealed above 1200 o C. A model for the formation of carbon nanocaps on 6H-SiC(000-1) was proposed. 0901-Ra11-13-Rb11-13.1 Mater. Res. Soc. Symp. Proc. Vol. 901E