Analogous with single-walled carbon nanotubes, Double-Walled CNTs (DWCNTs, DWNTs) pertain to the group of one-dimensional materials. This specific class of carbon nanotube comprises of two nanotubes, with one settled inside the other. The distinctions in the widths and chirality of the two nanotubes can create shifting degrees of collaboration between the two tubes since the chirality determines whether Double-Walled CNTs will be semiconducting or metallic. This takes into account changes to be made to the external nanotube without modifying the internal nanotube's properties, and results in one of a kind and intriguing properties. It is possible to achieve metallic-metallic, semiconducting-metallic, metallic-semiconducting or semiconducting-semiconducting interactions. Furthermore ,the metallic and semiconducting properties can differ contingent on the exact lattice parameters, which capacitates an extensive variety of conceivable property blends. There are various zones in which Double-Walled CNTs can be applied due to their great mechanical and electrical properties. The benefits of predominant thermal and mechanical properties of Double-Walled CNTs could make Double Wall Carbon Nanotubes a phenomenal material for composite materials. Double-Walled CNTs can be used in gas sensors as delicate materials for the identification of gases,dielectrics and in fact requesting applications,such as, field-emission displays and photovoltaics.