Multi-Walled Carbon Nanotubes (MWNTs) -COOH Functionalized: Properties, Synthesis, and Applications Introduction Multi-Walled Carbon Nanotubes (MWNTs) consist of multiple concentric layers of graphene rolled into cylindrical nanostructures. Due to their unique mechanical, electrical, and thermal properties, MWNTs are valuable in a wide range of advanced applications. Functionalization with carboxyl (-COOH) groups enhances their versatility, providing new...