**Author Contributions**

V.B.: Plasma treatment; R.P.-B.: TEM analyses and discussion of the results; A.A.-Y.: TEM analysis and discussion of the results; T.L.: Theoretical calculations; G.S.: Theoretical calculations; R.T.: Analysis of the nanotubes, discussion and the dissemination of the results; A.Z.: Synthesis of inorganic multiwall WS2 nanotubes, TEM/SEM analyses, discussion of the plasma experiment, discussion the dissemination of the results.
