The addition of CNT improved the conductivity of several polymers, such as PCL , polypropylene (PP) , PLA , and chitosan-PCL . The dispersion of conductive carbon nanoparticles (e.g., CB, CNTs) in PLA can be improved via the addition of ramie fiber (RF)/PLA, resulting in different sensing mechanisms . PCL/CNTs nanocomposites were synthesized via in-situ grafting and polymerization of PCL and CNTs . It exhibits good conductivity enabling quantitative sensing of organic vapors . The melt-blown method synthesized PCL/PP/CNTs . A 3 wt.% CNTs offered a significant high electrical resistance of the polymer nanocomposites, enabling the detection of various solvents .