杨飞鹏,郑学军,张欢,黄宽,彭金峰.不同角度晶界对单层多晶二硫化钼摩擦性能的影响[J].表面技术,2020,49(2):158-164.
YANG Fei-peng,ZHENG Xue-jun,ZHANG Huan,HUANG Kuan,PENG Jin-feng.Influence of Grain Boundary at Different Angles on the Friction Properties of Monolayer Polycrystalline MoS2[J].Surface Technology,2020,49(2):158-164 |
| 不同角度晶界对单层多晶二硫化钼摩擦性能的影响 |
| Influence of Grain Boundary at Different Angles on the Friction Properties of Monolayer Polycrystalline MoS2 |
| 投稿时间：2019-06-02 修订日期：2020-02-20 |
| DOI：10.16490/j.cnki.issn.1001-3660.2020.02.019 |
| 中文关键词: 原子力显微镜 晶界 MoS2 摩擦性能 褶皱效应 摩擦耗散 |
| 英文关键词:atomic force microscope grain boundary MoS2 friction properties pucker effect friction dissipation |
| 基金项目:国家自然科学基金（11832016，51775471）；湖南省自然科学基金（2019JJ50599）；湖南省教育厅一般项目（17C1516） |
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| Author | Institution |
| YANG Fei-peng | a.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China |
| ZHENG Xue-jun | a.School of Mechanical Engineering, b.Engineering Research Center of Complex Tracks Processing Technology and Equipment of the Ministry of Education, Xiangtan University, Xiangtan 411105, China |
| ZHANG Huan | a.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China |
| HUANG Kuan | a.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China |
| PENG Jin-feng | a.School of Mechanical Engineering, Xiangtan University, Xiangtan 411105, China |
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| 中文摘要: |
| 目的 考察不同角度晶界对单层多晶二硫化钼纳米片摩擦性能的影响，并探究其摩擦耗散机理。 方法 用化学气相沉积法（CVD）制备单层多晶二硫化钼（MoS2），通过原子力显微镜力曲线测试和摩擦力实验，分别得出无晶界区域和晶界处的粘附力、摩擦系数、摩擦耗散。结果 对于单层多晶MoS2，无晶界区域粘附力为7.20 nN，不同角度晶界处粘附力为11.11nN至11.40 nN。无晶界区域及-6°、33°、88°晶界区域（400 nm×400 nm）摩擦系数分别为0.006 19、0.006 45、0.007 37和0.017 60。在30~150 nN法向载荷范围内，探针经过无晶界区域产生的摩擦耗散变化范围为33.93×10-16~46.88×10-16 J，-6°晶界区域为37.15× 10-16~52.09×10-16 J，33°晶界区域为38.76×10-16~55.18×10-16 J，88°晶界区域为46.59×10-16~59.72×10-16 J。结论 晶界处吸附的极性粒子加强了探针与MoS2表面的相互作用，使得晶界处的粘附力比无晶界区域的大，但晶界角度对粘附力的影响不大。在一定测试范围内，晶界区域的摩擦系数要比无晶界区域的摩擦系数大，并随晶界角度增加而增大，摩擦过程中晶界区域产生的摩擦耗散也比无晶界区域多。晶界角度的不同可能会造成晶界处的弯曲刚度存在差异，从而探针滑移经过不同角度晶界时导致不同程度的褶皱效应。并且随着法向载荷的增大，探针在MoS2表面引起的面内变形程度越来越高，这样会引起表面褶皱效应，从而导致摩擦过程中产生的能量耗散随晶界角度和法向载荷增大而增加。 |
| 英文摘要: |
| The work aims to investigate the influence of grain boundary at different angles on the friction properties of monolayer polycrystalline molybdenum disulfide (MoS2) nanosheets and study the corresponding friction dissipation mechanisms. The monolayer polycrystalline MoS2 nanosheets were prepared by chemical vapor deposition and force curve test and friction testwere taken to obtain adhesion force, friction coefficient and friction dissipation by atomic force microscope, respectively. For the monolayer polycrystalline MoS2 nanosheet, the adhesion force was 7.20 nN in the non-grain boundary region, and the adhesion forces were from 11.11 to 11.40 nN in the grain boundary at different angles. The friction coefficients of the non-grain boundary region and -6°, 33° and 88° grain boundary regions (400 nm×400 nm) were 0.006 19, 0.006 45, 0.007 37 and 0.017 60, respectively. Under normal load at the range of 30 nN~150 nN, the friction dissipations of different regions were increasing from 33.93×10-16 J to 46.88×10-16 J at the non-grain boundary region, from 37.15×10-16 J to 52.09×10-16 J at the -6° grain boundary region, from 38.76×10-16 J to 55.18×10-16 J at the 33° grain boundary region and, from 46.59×10-16 J to 59.72×10-16 J at the 88° grain boundary region. The polarity particles adsorbed at grain boundary strengthen the interaction between tip and MoS2 surface, so the adhesion forces at grain boundary are larger than that at the area without grain boundary, but angles have little effect on adhesion. Within centain test range, the friction coefficients and friction dissipations in the grain boundary regionsare larger than those in the non-grain boundary regions, and friction coefficients increase with grain boundary angles. There are discrepancies in bending stiffness of grain boundaries at different angles, which leads to different pucker effect when the probe slides through grain boundaries. Higher normal load will cause more out-of-plane deformation, causing surface pucker effect. Therefore, friction dissipation increases with grain boundary angles and normal load. |
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