**5. Conclusion**

In recent years, the CNTs and graphene-based improved nanocomposites have been found to play a significant role in a wide range of potential applications. The incorporation of CNTs and graphene nanofillers into a matrix of particular materials either polymer activated carbon, metal, metal oxide, and fibers, upgrades their novel properties, such as excellent mechanical stability (in terms of strength, toughness, flexibility, Young's modulus, dimension stability, etc.), good optical features, flame retardancy, low water/gas permeability, and high electro-thermal conductivity. The improved nanocomposites material is known as the material of the 21st century because of their widespread applications in different fields such as energy storage, medical, wastewater treatment, aerospace, etc.
