Figure 5
From: Heteroepitaxial Growth of Single-Walled Carbon Nanotubes from Boron Nitride

Illustration of the heteroepitaxial growth process.
(a) A pristine BNNF with both closed and open surface edges. (b) Amorphous carbon coating on the surface edges of the BNNF. (c) Formation of carbon caps at the open edges. (d) Epitaxial growth of SWCNTs.