Figure 7
From: Geometric analysis of shape transition for two-layer carbon–silicon nanotubes
Graphene curls into nanotubes, where blue balls are for Si atoms and gray for C atoms. (is the model coordinates generated by Xiangyan Luo using python and then rendered by a software in-house developed by Dr. Tian who is an author of this paper. Finally, with Photoshop the three pictures (the honeycomb grid, the graphene sheet in 3D model, and the two-layer nano-tube) are combined and polished).
