Tribology Letters

, 67:118 | Cite as

In-Situ Synthesis Strategy of Monodispersed Ag2S Nanoparticles to Modify Wear Resistance of Polyamide-imide Nanocomposite Lubricating Coatings

  • Yanjun Ma
  • Yinping YeEmail author
  • Hongqi WanEmail author
  • Lei Chen
  • Huidi Zhou
  • Jianmin ChenEmail author
Original Paper


A novel in-situ-synthesis strategy via one-pot thermal decomposition of a single-source precursor was developed to fabricate silver sulfide (Ag2S) nanoparticles with monodispersity and narrow size distribution in the polyamide-imide (PAI) nanocomposite coatings. The crystalline phases, size, morphologies, and growth mechanism of the in-situ-synthesized Ag2S nanoparticles were characterized by X-ray diffraction, ultrahigh-resolution field emission scanning electron microscopy, Fourier transform infrared spectroscopy, and thermogravimetric analysis. The enhancement effect of such in-situ-synthesized Ag2S nanoparticles on the microhardness and tribological behaviors of the PAI nanocomposite coatings were also investigated and compared with mechanically mixed Ag2S particles. Results show that the growth of Ag2S particles is greatly limited during the in-situ preparation process. The Ag2S nanoparticles with small size ranging from 100 to 130 nm are purely formed and exhibit monodispersibility in the PAI nanocomposite coatings. Besides, the appropriate Ag2S nanoparticles greatly promote the microhardness and antiwear performance of the PAI nanocomposite coatings, especially when their incorporation content reaches 5.0 wt%. The enhancement effects of these in-situ-synthesized Ag2S nanoparticles on microhardness and wear resistance of PAI nanocomposite coatings are superior to that of the mechanically mixed Ag2S particles. This is attributed to the improvement of cohesion strength and the load-carrying capacity of the PAI nanocomposite coatings enhanced by in-situ-synthesized Ag2S nanoparticles.


In-situ synthesis Ag2S nanoparticles Monodisperse Wear resistance Nanocomposites 



This study was financially supported by The National Natural Science Foundation of China (Grant Nos. 51775533 and 51305430). The authors are very grateful to Dr. Y. G. Chao and Dr. F. Yue for their help in the characterization of FESEM.

Compliance with Ethical Standards

Conflicts of interest

The authors declare that they have no conflicts of interest.

Supplementary material

11249_2019_1231_MOESM1_ESM.docx (2 mb)
Electronic supplementary material 1 (DOCX 2060 kb)


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Authors and Affiliations

  1. 1.State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical PhysicsChinese Academy of SciencesLanzhouPeople’s Republic of China
  2. 2.Center of Materials Science and Optoelectronics EngineeringUniversity of Chinese Academy of SciencesBeijingPeople’s Republic of China

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