Carbon nanotubes, particularly double-walled ones, are widely used in electronics due to their excellent electrical conductivity and mechanical strength. They are incorporated into transistors, sensors, and conductive films to enhance performance and durability. In energy storage, they serve as key components in batteries and supercapacitors, improving energy density and charge-discharge cycles. Their high surface area and strength make them ideal for reinforcing composite materials in aerospace, automotive, and construction industries, resulting in lighter and stronger products. Additionally, they are utilized in biomedical applications, such as drug delivery systems and tissue engineering scaffolds, due to their biocompatibility and ability to penetrate cell membranes. Their unique properties also make them valuable in environmental applications, including water filtration and pollutant adsorption.