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A facile in situ synthesis approach and a size control strategy were established to obtain Ag 2 S nanoparticles in polyimide (PI) composite coatings. Such Ag 2 S nanoparticles in the composite coatings were characterized, and the effects of the as-obtained Ag 2 S nanoparticles of different sizes on the mechanical and tribological properties of the nanocomposite coatings were investigated. Results indicate that the in situ synthesized Ag 2 S nanoparticles exhibited good dispersibility and bimodal and multimodal size distribution in the nanocomposite coatings. The size of the Ag 2 S nanoparticles can be effectively controlled by adjusting the substituent alkyl chain length of single-source precursor, and these Ag 2 S nanoparticles exhibited superior improvement to mechanical and tribological properties of the nanocomposite coatings. More importantly, the Ag 2 S nanoparticles with the proper grain size and bimodal size distribution provided the optimal mechanical and tribological properties for the nanocomposite coatings, and the excellent tribological properties were attributed to their outstanding mechanical properties and strong ability to form a homogenous and stable protective tribofilm.

nanomaterials

Highly Dispersed Ag2S Nanoparticles: In Situ Synthesis, Size Control, and Modification to Mechanical and Tribological Properties towards Nanocomposite Coatings