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Characterization of Frictional Properties of Single-Layer Molybdenum-Disulfide Film Based on a Coupling of Tip Radius and Tip–Sample Distance by Molecular-Dynamics Simulations.
- Source :
- Nanomaterials (2079-4991); Jun2018, Vol. 8 Issue 6, p387, 1p
- Publication Year :
- 2018
-
Abstract
- Lateral-force microscopy is a powerful tool to study the frictional properties of two-dimensional materials. However, few works distinctly reveal the correlation between the tip radius with the tip–sample distance and the frictional properties of the two-dimensional (2D) materials. We performed molecular-dynamics simulations to study the atomic-scale friction of a typical two-dimensional single-layer molybdenum disulfide (SLMoS<subscript>2</subscript>). The effects of tip radius and tip–sample distance on the frictional properties were analyzed and discussed. The frictional force–sliding-distance curves show typical stick–slip behaviors, and the periodicity can be used to characterize the lattice constants of SLMoS<subscript>2</subscript>. Sub-nanoscale stick-slip movements occur in one-lattice sliding periods along with only the armchair (AC) direction and only when the tip radius is smaller than 3 Å with 1.47 Å tip-sample distance. At the same tip–sample distance, a smaller tip can provide a more detailed characterization and higher-precision frictional properties of SLMoS<subscript>2</subscript>. A larger tip is capable of providing comparative frictional properties of SLMoS<subscript>2</subscript> at a proper vertical tip–sample distance, compared with the small tip. [ABSTRACT FROM AUTHOR]
- Subjects :
- MOLYBDENUM disulfide
MOLECULAR dynamics
PHOTOLUMINESCENCE
Subjects
Details
- Language :
- English
- ISSN :
- 20794991
- Volume :
- 8
- Issue :
- 6
- Database :
- Complementary Index
- Journal :
- Nanomaterials (2079-4991)
- Publication Type :
- Academic Journal
- Accession number :
- 131312658
- Full Text :
- https://doi.org/10.3390/nano8060387