Bifurcation of nanoscale thermolubric friction behavior for sliding onMoS2,Physical Review Materials

当前位置： X-MOL 学术 › Phys. Rev. Materials › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Bifurcation of nanoscale thermolubric friction behavior for sliding onMoS2
Physical Review Materials ( IF 3.1 ) Pub Date : 2021-08-26 , DOI: 10.1103/physrevmaterials.5.083607
Kathryn R. Hasz ₁ , Mohammad R. Vazirisereshk ₂ , Ashlie Martini ₂ , Robert W. Carpick ₃

Affiliation

We present atomic force microscopy experiments of wearless sliding between nanoscale tips and both bulk and monolayer

Mo S_{2}

in ultrahigh vacuum across a wide range of temperatures (150–450 K) and scanning speeds (5 nm/s to 500

μ m / s

). Atomic lattice stick-slip behavior is consistently resolved. However, a bifurcation of behavior is seen, with some measurements showing a strong decrease in friction with increasing temperature and others showing athermal and low friction under nominally identical conditions. The difference between thermal and athermal behavior is attributed to a change in the corrugation of the potential energy surface, possibly due to trace amounts of adsorbed contaminants. While the speed dependence at a given temperature is consistent with the thermal Prandtl-Tomlinson model for atomic-scale friction, that is not the case for the temperature dependence (when it is present), nor can the temperature dependence be described by other existing models. We discuss the limitations of these models considering the measured results.

中文翻译：

在 MoS2 上滑动的纳米级热润滑摩擦行为的分叉

我们展示了纳米级尖端与体层和单层之间无磨损滑动的原子力显微镜实验

莫 秒_{2}

在超高真空中，温度范围广（150–450 K）和扫描速度（5 nm/s 到 500

μ 米 / 秒

）。原子晶格粘滑行为始终得到解决。然而，可以看到行为的分歧，一些测量显示摩擦随温度升高而显着降低，而其他测量显示在名义上相同的条件下无热和低摩擦。热和非热行为之间的差异归因于势能表面波纹的变化，这可能是由于痕量吸附的污染物所致。虽然给定温度下的速度依赖性与原子级摩擦的热 Prandtl-Tomlinson 模型一致，但温度依赖性（当存在时）并非如此，温度依赖性也不能用其他现有模型来描述. 考虑到测量结果，我们讨论了这些模型的局限性。

更新日期：2021-08-26

点击分享查看原文

点击收藏

公开下载

阅读更多本刊最新论文