Abstract
Two-dimensional compounds combining group IV A element and group V A element were determined to integrate the advantages of the two groups. As a typical 2D group IV–V material, SiP has been widely used in photodetection and photocatalysis due to its high carrier mobility, appropriate bandgap, high thermal stability, and low interlayer cleavage energy. However, its adhesion and friction properties have not been extensively grasped. Here, large-size and high-quality SiP crystals were obtained by using the flux method. SiP nanosheets were prepared by using mechanical exfoliation. The layer-dependent and velocity-dependent nanotribological properties of SiP nanosheets were systematically investigated. The results indicate the friction force of SiP nanosheets decreases with the increase in layer number and reaches saturation after five layers. The coefficient of friction of multilayer SiP is 0.018. The mean friction force, frictional vibrations, and the friction strengthening effect can be affected by sliding velocity. Specially, the mean friction force increases with the logarithm of sliding velocity at nm/s scale, which is dominated by atomic stick-slip. The influence of frequency on frictional vibration is greater than speed due to the different influences on the change in contact quality. The friction strengthening saturation distance increases with the increase in speed for thick SiP nanosheets. These results provide an approach for manipulating the nanofriction properties of SiP and serve as a theoretical basis for the application of SiP in solid lubrication and microelectromechanical systems.
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Acknowledgements
Thanks for the financial support of the Program for Taishan Scholars of Shandong Province (No. ts20190965), the National Key R&D Program of China (No. 2020YFF0304600), the National Natural Science Foundation of China (No. 51905518), the Key Research Program of the Chinese Academy of Sciences (No. XDPB24) and the Innovation Leading Talents Program of Qingdao (No. 19-3-2-23-zhc) in China.
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Zishuai WU. He received his master degree in materials science and engineering from Northwestern Polytechnical University in 2022 and received his bachelor degree in mechanical engineering from Shanghai Jiao Tong University in 2019. Now, he is a Ph.D. student in mechanical engineering from Shanghai Jiao Tong University. His research interests focus on nanotribology and triboelectricity of two-dimensional materials and computational design of materials.
Tongtong YU. He received his Ph.D. degree in materials science and engineering from Shandong University in 2019. He is currently an assistant researcher in the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. His research interests include growth, tribology, and triboelectrification of 2D materials.
Daoai WANG. He received his Ph.D. degree in Lanzhou Institute of Chemical Physics, CAS. From 2009 to 2010, he worked as a Postdoc in Max Planck Institute of Microstructure Physics. From 2010 to 2013, he worked as a JSPS researcher in the University of Tokyo. He is currently a professor and the deputy director in the State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences. His research interests include triboelectrification, anti-static, physics, and chemistry in tribology.
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Wu, Z., Yu, T., Wu, W. et al. Nanotribology of SiP nanosheets: Effect of thickness and sliding velocity. Friction 10, 2033–2044 (2022). https://doi.org/10.1007/s40544-021-0570-9
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DOI: https://doi.org/10.1007/s40544-021-0570-9