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Organic-Inorganic Hybrid Solid Lubricants Based on 2D Silver Thiolate Coordination Polymers Featuring Precise
Ren Muramatsu1, Hiroshi Eguchi1, Kenji Nagata1
1Department of Life Science and Applied Chemistry, Graduate School of Engineering, Nagoya Institute of Technology, Gokiso-cho, Showa-ku, Nagoya 466-8555, Japan.
Langmuir : the ACS Journal of Surfaces and Colloids
|October 11, 2025
Summary
Two-dimensional silver thiolate (AgSR) coordination polymers show promise as tunable solid lubricants. These materials exhibit lower friction than traditional lubricants like MoS2, offering advantages for custom lubricant development.
Area of Science:
- Materials Science
- Tribology
- Nanotechnology
Background:
- Layered solid lubricants like molybdenum disulfide (MoS2) are crucial for reducing friction and wear.
- Limited structural diversity in traditional lubricants hinders tailored performance for specific applications.
Purpose of the Study:
- To explore two-dimensional silver thiolate (AgSR) coordination polymers as tunable solid lubricants.
- To investigate the structure-property relationships governing the lubrication performance of AgSR.
Main Methods:
- Synthesis and characterization of AgSR coordination polymers with varying ligands.
- X-ray diffraction for structural analysis.
- Ball-on-plate friction tests to evaluate lubricating properties.
- Surface analysis using scanning electron microscopy and energy-dispersive X-ray spectroscopy.
Main Results:
- AgSR compounds formed highly crystalline layered structures.
- AgSR with alkylthiolato ligands demonstrated a low coefficient of friction (COF) of ~0.1, outperforming MoS2.
- AgSR formed lubricating films on sliding surfaces.
- AgSR with para-substituted benzenethiolato ligands showed tunable COF (~0.7) based on interlayer interactions (e.g., hydrogen bonds).
Conclusions:
- AgSR coordination polymers offer tunable solid lubrication properties through precise structural design.
- Their unique layered structures and tunable interlayer interactions provide advantages over traditional inorganic lubricants.
- AgSR represents a promising platform for developing custom solid lubricants for diverse applications.
