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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 …