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Nanomaterials 2018, 8(6), 387; https://doi.org/10.3390/nano8060387

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

1
School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350108, China
2
Fujian Key Laboratory of Medical Instrumentation and Pharmaceutical Technology, Fuzhou University, Fuzhou 350108, China
3
Fujian Collaborative Innovation Center of High-End Manufacturing Equipment, Fuzhou University, Fuzhou 350108, China
4
College of Information & Mechanical and Electrical Engineering, Ningde Normal University, Ningde 352100, China
*
Authors to whom correspondence should be addressed.
Received: 12 May 2018 / Revised: 26 May 2018 / Accepted: 28 May 2018 / Published: 31 May 2018
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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 (SLMoS2). 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 SLMoS2. 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 SLMoS2. A larger tip is capable of providing comparative frictional properties of SLMoS2 at a proper vertical tip–sample distance, compared with the small tip. View Full-Text
Keywords: lateral force microscopy; MoS2; frictional properties; tip radius; vertical tip-sample distance lateral force microscopy; MoS2; frictional properties; tip radius; vertical tip-sample distance
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Pang, H.; Li, M.; Gao, C.; Lai, L.; Zhuo, W. 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. Nanomaterials 2018, 8, 387.

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