Journal
NANO LETTERS
Volume 17, Issue 7, Pages 4116-4121Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.7b00871
Keywords
Tribology; transition metal dichalcogenides; 2D materials; shear stress; atomic force microscopy
Categories
Funding
- Nanoscience Institute
- Air Force Office of Scientific Research
Ask authors/readers for more resources
Nanometer-scale crystals of the two-dimensional oxide molybdenum trioxide (MoO3) were formed atop the transition metal dichalcogenides MoS2 and MoSe2. The MoO3 nanocrystals are partially commensurate with the dichalcogenide substrates, being aligned only along one of the substrate's crystallographic axes. These nanocrystals can be slid only along the aligned direction and maintain their alignment with the substrate during motion. Using an AFM probe to oscillate the nanocrystals, it was found that the lateral force required to move them increased linearly with nanocrystal area. The slope of this curve, the interfacial shear strength, was significantly lower than for macroscale systems. It also depended strongly on the duration and the velocity of sliding of the crystal, suggesting a thermal activation model for the system. Finally, it was found that lower commensuration between the nanocrystal and the substrate increased the interfacial shear, a trend opposite that predicted theoretically.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available