Wetting and interfacial adsorption in the Blume-Capel model on the square lattice

The structural and electronic properties of Cu_5-1 and Cu_6-1 nanowires with core-shell structures encapsulated inside a series zigzag (n,0) BeONTs denoted by Cu_5-1@(n,0) and Cu_6-1@(n,0) are investigated using the first-principles calculations within the generalized-gradient approximation. For Cu_5-1@(n,0) (10 ? n ? 17) and Cu_6-1@(n,0) (11 ? n ? 18) combined systems, the initial shapes (cylindrical BeONTs and CuNWs) are preserved without any visible change after optimization. The quantum conductances 5G ₀ and 6G ₀ of the most stable Cu_5-1@(12,0) and Cu_6-1@(13,0) combined systems are identical to the corresponding free-standing Cu_5-1 and Cu_6-1 nanowires, respectively. The energy bands crossing the Fermi level in both the Cu_5-1@(12,0) and Cu_6-1@(13,0) combined systems are all originated from the inner CuNWs. Therefore the electron transport will occur only through the inner CuNWs and the outer inert BeONTs serves well as an insulating cable sheath. The robust quantum conductance of the Cu_5-1 and Cu_6-1 nanowires, the insulating protection character of the (12,0) and (13,0) BeONTs and the highest stability of the tube-wire combined systems make the Cu_5-1@(12,0) and Cu_6-1@(13,0) combined systems are top-priority in the ULSI circuits and MEMS devices that demand steady transport of electrons.