title: Experimental study and modeling of atomic-scale friction in zigzag and armchair lattice orientations of MoS2.
abstract: Physical properties of two-dimensional materials, such as graphene, black phosphorus, molybdenum disulfide (MoS2) and tungsten disulfide, exhibit significant dependence on their lattice orientations, especially for zigzag and armchair lattice orientations. Understanding of the atomic probe motion on surfaces with different orientations helps in the study of anisotropic materials. Unfortunately, there is no comprehensive model that can describe the probe motion mechanism. In this paper, we report a tribological study of MoS2in zigzag and armchair orientations. We observed a characteristic power spectrum and friction force values. To explain our results, we developed a modified, two-dimensional, stick-slip Tomlinson model that allows simulation of the probe motion on MoS2surfaces by combining the motion in the Mo layer and S layer. Our model fits well with the experimental data and provides a theoretical basis for tribological studies of two-dimensional materials.
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang110016, PRChina; University of the Chinese Academy of Sciences, Beijing100049, PRChina.
authors.forename: Meng
authors.initials: M
authors.lastname: Li
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang110016, PRChina; University of the Chinese Academy of Sciences, Beijing100049, PRChina.
authors.forename: Jialin
authors.initials: J
authors.lastname: Shi
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences , Shenyang 110016 , PR China.
authors.forename: Lianqing
authors.initials: L
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences , Shenyang 110016 , PR China.
authors.forename: Peng
authors.initials: P
authors.lastname: Yu
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences, Shenyang110016, PRChina; Department of Electrical and Computer Engineering, Michigan State University, East Lansing, Michigan48824, PRUSA.
authors.forename: Ning
authors.initials: N
authors.lastname: Xi
authors.affiliation: State Key Laboratory of Robotics, Shenyang Institute of Automation, Chinese Academy of Sciences , Shenyang 110016 , PR China.
authors.forename: Yuechao
authors.initials: Y
authors.lastname: Wang
keywords: 100 Materials; 105 Low-Dimension (1D/2D) materials; 200 Applications; 212 Surface and interfaces; 300 Processing / Synthesis and Recycling; 303 Mechanical / Physical processing; 40 Optical, magnetic and electronic device materials; MoS2; atomic-scale friction; lattice orientation; two-dimensional model