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单层二硫化钼力学性能温度和手性效应的分子动力学模拟

李明林 万亚玲 胡建玥 王卫东

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单层二硫化钼力学性能温度和手性效应的分子动力学模拟

李明林, 万亚玲, 胡建玥, 王卫东

Molecular dynamics simulation of effects of temperature and chirality on the mechanical properties of single-layer molybdenum disulfide

Li Ming-Lin, Wan Ya-Ling, Hu Jian-Yue, Wang Wei-Dong
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  • 针对文献中单层二硫化钼力学性能随温度变化趋势的不明确,本文基于Stillinger-Weber(SW)原子间势函数,采用经典分子动力学方法对单层二硫化钼在不同热力学温度下(1-800 K)的力学行为进行了单轴拉伸模拟,研究温度和手性对其力学性能的影响. 结果表明:单层二硫化钼的杨氏模量、抗拉强度、拉伸极限应变等力学性能均随温度的升高而显著减小;单层二硫化钼的杨氏模量和抗拉强度存在明显的手性效应,而不同手性方向的拉伸极限应变差别不大,可以忽略;温度低于800 K时,不同手性二硫化钼断裂之前受拉加载和卸载均没有明显的相变发生;温度在1 K时,沿锯齿方向受拉的单层二硫化钼在极限强度附近会有明显的局部相变发生,且卸载时相变结构能保持稳定. 本文也测量出单层二硫化钼在温度1-800 K下沿扶手和锯齿方向的线膨胀系数.
    Recently, the effect of temperature on the mechanical property (the Young's modulus) of the single-layer molybdenum disulfide (SLMoS2) is shown to be insignificant, which is obviously incompatible with the previously published result, i. e. the Young's modulus of SLMOS2 decreases monotonically as temperature increases. Aiming at clarifying the relationships between the mechanical properties of the single-layer molybdenum disulfide (SLMoS2) along the armchair (AC) and zigzag (ZZ) directions and the temperature, classical molecular dynamics (MD) simulations are performed to stretch the SLMoS2 along the AC and ZZ directions at the temperatures ranging from 1 K to 800 K by using the Stillinger-Weber (SW) interatomic potentials in this paper. The mechanical properties of SLMoS2 at the temperatures ranging from 1 K to 800 K, including ultimate strength, ultimate strain, and Young's Modulus, are calculated based on the stress-strain results obtained from the simulations. Results are obtained and given as follows. (1) The mechanical properties of the SLMoS2, including the ultimate strength and Young's modulus, are found to monotonically decrease as temperature increases. Increasing the temperature, the ultimate strength of SLMoS2 in the AC direction drops faster than in the ZZ direction, whereas the Young's modulus of SLMoS2 in the ZZ direction decreases quicker than in the AC direction, which means that the chirality effect on the ultimate strength is remarkably different from the Young's modulus of SLMoS2. However, the ultimate strain in the ZZ direction at the temperatures in a range from 1 K to 800 K is close to that in the AC direction, which means that the effect of chirality on the ultimate strain is insignificant. (2) Unlike the published results in the literature, the phase transition of SLMoS2 is found to only occur at a temperature of 1 K and at the moment of initial crack formation as tensiled along the ZZ direction, and the new phase of quadrilateral structure keeps stable after unloading. (3) The linear thermal expansion coefficients along the ZZ and AC directions are also measured, the magnitudes of which are found to be consistent with the published experimental results. Our simulation results support the viewpoint that the effect of the temperature on the mechanical property of SLMoS2 is significant, and the SLMoS2 can be regarded as an anisotropic material as the chirality effect cannot be ignored. The linear thermal expansion coefficients obtained with MD simulation are all in good agreement with the experimental data.
      Corresponding author: Li Ming-Lin, liminglin@fzu.edu.cn;wangwd@mail.xidian.edu.cn ; Wang Wei-Dong, liminglin@fzu.edu.cn;wangwd@mail.xidian.edu.cn
    • Funds: Project supported by the Young Scientists Fund of the National Natural Science Foundation of China (Grant Nos. 50903017, 51205302).
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    Wang W, Li S, Min J, Yi C, Zhan Y, Li M L 2014 Nanoscale Res. Lett. 9 41

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  • [1]

    Savan A, Pflger E, Voumard P, Schrer A, Simmonds M 2000 Lubr. Sci. 12 185

    [2]

    Radisavljevic B, Radenovic A, Brivio J, Giacometti V, Kis A 2011 Nat. Nanotechnol. 6 147

    [3]

    Yin Z, Li H, Li H, Jiang L, Shi Y, Sun Y, Lu G, Zhang Q, Chen X, Zhang H 2011 ACS Nano 6 74

    [4]

    Lee J, Wang Z, He K, Shan J, Feng P X L 2013 ACS Nano 7 6086

    [5]

    Zhang P, Ma L, Fan F, Zeng Z, Peng C, Loya P E, Liu Z, Gong Y, Zhang J, Zhang X 2014 Nat. Commun. 5

    [6]

    Gan Y, Zhao H 2014 Phys. Lett. A 378 2910

    [7]

    Li T 2012 Phys. Rev. B 85 235407

    [8]

    Yue Q, Kang J, Shao Z, Zhang X, Chang S, Wang G, Qin S, Li J 2012 Phys. Lett. A 376 1166

    [9]

    Peng Y, Meng Z, Zhong C, Lu J, Yu W, Jia Y, Qian Y 2001 Chem. Lett. 772

    [10]

    Bertolazzi S, Brivio J, Kis A 2011 ACS Nano 5 9703

    [11]

    Cooper R C, Lee C, Marianetti C A, Wei X, Hone J, Kysar J W 2013 Phys. Rev. B 87 035423

    [12]

    Castellanos-Gomez A, Poot M, Steele G A, van der Zant H S, Agrat N, Rubio-Bollinger G 2012 Nanoscale Res. Lett. 7 1

    [13]

    Jiang J W, Park H S, Rabczuk T 2013 J. Appl. Phys. 114 064307

    [14]

    Xiong S, Cao G 2015 Nanotechnology 26 185705

    [15]

    Jiang J W, Park H S 2014 Appl. Phys. Lett. 105 033108

    [16]

    Zhao J, Jiang J W, Rabczuk T 2013 Appl. Phys. Lett. 103 231913

    [17]

    Gamboa A, Vignoles G L, Leyssale J M 2015 Carbon 89 176

    [18]

    Li M L, Lin F, Chen Y 2013 Acta Phys. Sin. 62 016102 (in Chinese) [李明林, 林凡, 陈越 2013 物理学报 62 016102]

    [19]

    Shang F L, Guo X C, BeiCun L H, MeiYe Y C 2010 Advances in Mechanics 40 263 (in Chinese) [尚福林, 郭显聪, 北村隆行, 梅野宜崇 2010 力学进展 40 263]

    [20]

    Li M L, Wan Y L, Tu L P, Yang Y C, Lou J 2016 Nanoscale Res. Lett. 11 155

    [21]

    Wang W, Li S, Min J, Yi C, Zhan Y, Li M L 2014 Nanoscale Res. Lett. 9 41

    [22]

    Jiang J W 2015 Nanotechnology 26 315706

    [23]

    Plimpton S 1995 J. Comput. Phys. 117 1

    [24]

    Humphrey W, Dalke A, Schulten K 1996 J. Mol. Graphics 14 33

    [25]

    Han T W, He P F, Wang J, Wu A H 2009 J. Tongji University(Natural Science) 37 1638 (in Chinese) [韩同伟, 贺鹏飞, 王健, 吴艾辉 2009 同济大学学报: 自然科学版 37 1638]

    [26]

    Liu T, Liu M S 2014 Materials For Mechanical Engineering 38 73 (in Chinese) [刘彤, 刘敏珊 2014 机械工程材料 38 73]

    [27]

    El-Mahalawy S, Evans B 1976 J. Appl. Crystallogr. 9 403

    [28]

    Zhao J, Kou L, Jiang J W, Rabczuk T 2014 Nanotechnology 25 295701

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出版历程
  • 收稿日期:  2016-05-04
  • 修回日期:  2016-06-25
  • 刊出日期:  2016-09-05

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