Ab initio density functional theory investigation of structural and electronic properties of double-walled silicon carbide nanotubes

By using ab initio   density functional theory, the structural and electronic properties of (n,n)@(11,11)(n,n)@(11,11) double-walled silicon carbide nanotubes (SiCNTs) are investigated. Our calculations reveal the existence of an energetically favorable double-walled nanotube whose interwall distance is about 4.3 Å. Interwall spacing and curvature difference are found to be essential for the electronic states around the Fermi level.