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The Role of Fabric in Frictional Properties of Phyllosilicate-Rich Tectonic Faults
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Friction between van der Waals Solids during Lattice Directed Sliding.

Paul E Sheehan1,2, Charles M Lieber2

  • 1U.S. Naval Research Laboratory, Code 6177, Washington, DC 20375, United States.

Nano Letters
|June 2, 2017
PubMed
Summary
This summary is machine-generated.

Researchers studied sliding molybdenum trioxide (MoO3) nanocrystals on transition metal dichalcogenides. They found friction depends on nanocrystal size and sliding conditions, with lower friction than expected for nanoscale systems.

Keywords:
2D materialsTribologyatomic force microscopyshear stresstransition metal dichalcogenides

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Surface Science

Background:

  • Two-dimensional materials like molybdenum disulfide (MoS2) and molybdenum diselenide (MoSe2) are crucial in nanoscale electronics.
  • Understanding interfacial properties is key for developing novel nanoscale devices.

Purpose of the Study:

  • To investigate the friction and interfacial shear strength of nanometer-scale molybdenum trioxide (MoO3) crystals on MoS2 and MoSe2 substrates.
  • To explore the influence of nanocrystal size, sliding velocity, and substrate commensuration on friction.

Main Methods:

  • Formation of MoO3 nanocrystals on MoS2 and MoSe2 substrates.
  • Utilizing atomic force microscopy (AFM) to oscillate and slide nanocrystals.
  • Measuring lateral forces to determine interfacial shear strength.

Main Results:

  • Lateral friction force increased linearly with MoO3 nanocrystal area.
  • Interfacial shear strength was significantly lower than in macroscale systems.
  • Friction depended strongly on sliding duration and velocity, suggesting a thermal activation model.
  • Lower substrate commensuration unexpectedly increased interfacial shear, contradicting theoretical predictions.

Conclusions:

  • Nanoscale friction of MoO3 on transition metal dichalcogenides is size-dependent and influenced by sliding dynamics.
  • The observed friction behavior deviates from macroscale expectations and theoretical models, highlighting unique nanoscale phenomena.
  • Further research is needed to fully elucidate the mechanisms governing interfacial shear strength at the nanoscale.