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Ultra-low friction and patterning on atomically thin MoS2via electronic tight-binding.
Bin Shi1, Xuehui Gan1,2, Haojie Lang1
1College of Mechanical Engineering, Donghua University, Shanghai 201620, China.
Nanoscale
|October 21, 2021
Summary
Applying an electric field to 2D molybdenum disulfide (MoS2) significantly reduces friction, achieving an ultra-low state. This electronic tight-binding effect enhances lubrication for micro/nanoelectromechanical systems (MEMS/NEMS).
Area of Science:
- Materials Science
- Tribology
- Nanotechnology
Background:
- Atomically thin molybdenum disulfide (MoS2) is a key solid lubricant in micro/nanoelectromechanical systems (MEMS/NEMS).
- Achieving ultra-low friction is critical for enhancing the performance and longevity of MEMS/NEMS devices.
Purpose of the Study:
- To investigate the effect of electric fields on the friction of 2D MoS2.
- To understand the underlying mechanisms responsible for friction reduction.
- To explore the potential for patterning ultra-low friction states on MoS2 surfaces.
Main Methods:
- Atomic Force Microscopy (AFM) tip rubbing on MoS2/SiO2/Si substrate under an applied electric field.
- Experimental characterization of interfacial charge transfer and bonding.
- Controlled nanopatterning of ultra-low friction areas.
Main Results:
- Friction coefficient of MoS2 was reduced nearly fivefold to approximately 0.0045 under an electric field.
- Electric field induced charge accumulation at the MoS2/SiO2/Si interface, leading to electronic tight-binding.
- This electronic tight-binding suppresses atomic deformation and limits pinning, resulting in ultra-low friction.
- Controllable nanopatterning of ultra-low friction states was achieved.
Conclusions:
- Electric field application is a viable method to achieve ultra-low friction in 2D MoS2.
- The mechanism involves electric field-induced electronic tight-binding at the interface.
- Nanopatterning of ultra-low friction MoS2 opens new avenues for advanced MEMS/NEMS applications.
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