Double-walled carbon nanotubes (DWCNTs) are formed by two concentric SWCNTs and are therefore called "double-walled" nanotubes. The diameter of the DWCNTs is normally greater than that of the SWNTs, and it grows with the number of walls, being able to reach up to a few tens of nanometers. They have a variety of applications in different sectors and they will be discussed in detail in this article. Moreover, the structure and properties of DWCNTs are also discussed briefly. Structure of Double Walled Carbon Nanotubes The structure of DWCNTs consists of two layers of graphite sheets concentrically wounded with a space of 0.36 nm between them, with an external diameter of 10 to 50 nm, where each carbon atom is joined with three others by Sp 2 hybridization, the fourth carbon atom forms weak bond of the Van der Wall type with other graphite sheets. 5 Properties of DWCNTs 1. Electronically, DWCNTs can behave as semi-metallic, insulating, or meta...
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