Long Yuyang, Wang Xiao, Tan Wang, Li Baowen, Li Jidong, Deng Wei, Li Xuemei, Guo Wanlin, Yin Jun
State Key Laboratory of Mechanics and Control for Aerospace Structures, Key Laboratory for Intelligent Nano Materials and Devices of the Ministry of Education, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People's Republic of China.
Institute for Frontier Science, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, People's Republic of China.
Nano Lett. 2024 Jun 26;24(25):7572-7577. doi: 10.1021/acs.nanolett.4c00542. Epub 2024 Jun 11.
Achieving high-temperature superlubricity is essential for modern extreme tribosystems. Solid lubrication is the sole viable alternative due to the degradation of liquid ones but currently suffers from notable wear, instability, and high friction coefficient. Here, we report robust superlubricity in MoS/graphene van der Waals heterostructures at high temperatures up to ∼850 K, achieved through localized heating to enable reliable friction testing. The ultralow friction of the MoS/graphene heterostructure is found to be notably further reduced at elevated temperature and dominantly contributed by the MoS edge. The observation can be well described by a multi-contact model, wherein the thermally activated rupture of edge-contacts facilitates the sliding. Our results should be applicable to other van der Waals heterostructures and shed light on their applications for superlubricity at elevated temperature.
实现高温超润滑对于现代极端摩擦系统至关重要。由于液体润滑的退化，固体润滑是唯一可行的替代方案，但目前存在明显的磨损、不稳定性和高摩擦系数问题。在此，我们报告了在高达约850 K的高温下，通过局部加热实现可靠摩擦测试，在MoS/石墨烯范德华异质结构中实现了稳健的超润滑。发现MoS/石墨烯异质结构的超低摩擦在高温下显著进一步降低，且主要由MoS边缘贡献。这一观察结果可以用多接触模型很好地描述，其中边缘接触的热激活破裂促进了滑动。我们的结果应适用于其他范德华异质结构，并为其在高温超润滑中的应用提供启示。
