Author/Authors :
Maruyama، نويسنده , , Takahiro and Bang، نويسنده , , Hyungjin and Kawamura، نويسنده , , Yasuyuki and Fujita، نويسنده , , Naomi and Tanioku، نويسنده , , Kenji and Shiraiwa، نويسنده , , Tomoyuki and Hozumi، نويسنده , , Yoko and Naritsuka، نويسنده , , Shigeya and Kusunoki، نويسنده , , Michiko، نويسنده ,
Abstract :
Formation of nanosized cap structures on a thermally treated 6H–SiC(0 0 0 −1) substrate was investigated using atomic-resolution ultrahigh-vacuum scanning tunneling microscopy (UHV-STM). After removal of surface oxides by heating under UHV, clusters of carbon particles 1–2 nanometer in diameter were formed on the SiC surface at 1150 °C. Upon heating above 1150 °C, the carbon nanoparticles in the clusters merged, forming nanosized cap structures, which subsequently transformed into carbon nanotubes (CNTs). The clusters of nanosized carbon particles are thought to be the precursors of carbon nanocaps, and their sizes are strongly related to the sizes of CNT caps forming on the SiC surface.
