Tungsten disulfide inorganic nanotubes functionalized by ptfe for friction application

Tzuriel Levin, Yifat Harel, Jean Paul Lellouche, Alexey Moshkovich, Igor Lapsker, Alex Laikhtman, Lev Rapoport

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


Inorganic nanotubes (INTs) and fullerene‐like nanoparticles (NPs) of WS2/MoS2 penetrate and exfoliate at the contact interface and facilitate tribofilm formation. While the tribological properties are greatly improved by exfoliated NPs that shed easily, they may be diminished by agglomeration in oil. Therefore, surface functionalization is employed to improve dispersion in oil‐based suspensions. Here, WS2 INTs were functionalized by polytetrafluoroethylene (PTFE) in a simple and cost‐effective bath sonication method. WS2‐INTs with two concentrations of added PTFE were characterized by scanning and transmission electron microscopy, micro‐Raman spectroscopy, and thermogravimetric analysis. Superior distribution of WS2 was observed before and during friction experiments. Chemical analysis showed a significantly greater amount of PTFE‐coated INTs on rubbed surfaces, in accordance with the improved friction and wear properties.

Original languageEnglish
Article number78
Issue number8
StatePublished - Aug 2021

Bibliographical note

Publisher Copyright:
© 2021 by the authors. Licensee MDPI, Basel, Switzerland.


  • Agglomeration
  • Friction
  • PTFE
  • Surface functionalization
  • WS2 inorganic nanotubes


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