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The discovery of carbon nanotubes (CNTs) in 1991 has stimulated intensive research to characterize their structure and to determine their physical properties both by direct measurement and through predictive methods using modeling techniques. Many of their fundamental and remarkable properties are now well-known, and their exploitation in a wide range of applications forms a large part of the research effort now in progress. IntroductionThe electronic properties of carbon nanotubes (C …

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 …