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Related Concept Videos

Atomic Force Microscopy01:08

Atomic Force Microscopy

Atomic force microscopy (AFM) is a type of scanning probe microscopy that can analyze topographic details of various specimens like ceramics, glass, polymers, and biological samples. AFM offers over 1000 times more resolution than the optical imaging system. Images generated from AFM are three-dimensional surface profiles, offering an advantage over the flat, two-dimensional images from other imaging techniques.
The AFM Probe
The probe is regarded as the heart of any AFM setup and comprises the...

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Probing tribological evolution in atomically thin MoS2 at different scales.

Xingzhong Zeng1, Miao Zhang2

  • 1School of Intelligent Manufacturing, Hunan First Normal University, Changsha 410205, China.

Beilstein Journal of Nanotechnology
|May 13, 2026
PubMed
Summary

Sub-nanoscale friction in two-dimensional (2D) molybdenum disulfide (MoS2) shows load-dependent stick-slip motion. The strengthening effect increases with load but decreases with MoS2 layer thickness, impacting micro/nanoelectromechanical systems design.

Keywords:
MoS2atomic force microscopystrengthening effectsub-nanoscale stick–slip motion

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Area of Science:

  • Nanotribology
  • Materials Science
  • Surface Science

Background:

  • Atomic-scale stick-slip motion and nanoscale strengthening are key in 2D material nanotribology.
  • Sub-nanoscale origins and load-dependent evolution of these phenomena require further investigation.

Purpose of the Study:

  • To systematically investigate sub-nanoscale friction and strengthening effects in atomically thin molybdenum disulfide (MoS2) under controlled loads.
  • To quantify the load-dependent evolution of nanoscale strengthening and sub-nanoscale stick-slip motion.
  • To elucidate the underlying mechanisms governing these tribological behaviors.

Main Methods:

  • Utilized a calibrated atomic force microscope (AFM) to perform systematic friction measurements on MoS2.
  • Controlled applied load and MoS2 layer thickness during experiments.
  • Quantified slip distance as a metric for sub-nanoscale stick-slip motion.

Main Results:

  • Nanoscale strengthening intensifies with increasing load but weakens with more MoS2 layers.
  • Slip distance, a metric for stick-slip motion, transitions from constant to increasing, then decreasing with load.
  • Load-dependent transitions in friction are governed by competing mechanisms: contact quality, puckering effect, and static friction.

Conclusions:

  • Sub-nanoscale stick-slip motion and strengthening in MoS2 are critically dependent on applied load and layer thickness.
  • Understanding these load-dependent transitions provides insights for designing low-friction coatings.
  • Findings advance 2D material tribology to the sub-nanoscale, crucial for micro/nanoelectromechanical systems (MEMS/NEMS).