Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals

Friction anisotropy is one of the important friction behaviors for two-dimensional (2D) van der Waals (vdW) crystals. The effects of normal pressure and thickness on the interfacial friction anisotropy in few-layer graphene, <i>h</i>-BN, and MoSe<sub>2</sub> under constant no...

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Main Authors:	Kaibo Wang, Hao Li, Yufeng Guo
Format:	Article
Language:	English
Published:	MDPI AG 2021-08-01
Series:	Materials
Subjects:	two-dimensional crystals friction anisotropy pressure thickness first-principles calculations
Online Access:	https://www.mdpi.com/1996-1944/14/16/4717

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spelling	doaj-1add3917839d4b42a3aecd0468f8bab32021-08-26T14:01:37ZengMDPI AGMaterials1996-19442021-08-01144717471710.3390/ma14164717Interfacial Friction Anisotropy in Few-Layer Van der Waals CrystalsKaibo Wang0Hao Li1Yufeng Guo2State Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaState Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaState Key Laboratory of Mechanics and Control of Mechanical Structures and MOE Key Laboratory for Intelligent Nano Materials and Devices, College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, ChinaFriction anisotropy is one of the important friction behaviors for two-dimensional (2D) van der Waals (vdW) crystals. The effects of normal pressure and thickness on the interfacial friction anisotropy in few-layer graphene, <i>h</i>-BN, and MoSe<sub>2</sub> under constant normal force mode have been extensively investigated by first-principle calculations. The increase of normal pressure and layer number enhances the interfacial friction anisotropy for graphene and <i>h</i>-BN but weakens that for MoSe<sub>2</sub>. Such significant deviations in the interfacial friction anisotropy of few-layer graphene, <i>h</i>-BN and MoSe<sub>2</sub> can be mainly attributed to the opposite contributions of electron kinetic energies and electrostatic energies to the sliding energy barriers and different interlayer charge exchanges. Our results deepen the understanding of the influence of external loading and thickness on the friction properties of 2D vdW crystals.https://www.mdpi.com/1996-1944/14/16/4717two-dimensional crystalsfriction anisotropypressurethicknessfirst-principles calculations
collection	DOAJ
language	English
format	Article
sources	DOAJ
author	Kaibo Wang Hao Li Yufeng Guo
spellingShingle	Kaibo Wang Hao Li Yufeng Guo Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals Materials two-dimensional crystals friction anisotropy pressure thickness first-principles calculations
author_facet	Kaibo Wang Hao Li Yufeng Guo
author_sort	Kaibo Wang
title	Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals
title_short	Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals
title_full	Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals
title_fullStr	Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals
title_full_unstemmed	Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals
title_sort	interfacial friction anisotropy in few-layer van der waals crystals
publisher	MDPI AG
series	Materials
issn	1996-1944
publishDate	2021-08-01
description	Friction anisotropy is one of the important friction behaviors for two-dimensional (2D) van der Waals (vdW) crystals. The effects of normal pressure and thickness on the interfacial friction anisotropy in few-layer graphene, <i>h</i>-BN, and MoSe<sub>2</sub> under constant normal force mode have been extensively investigated by first-principle calculations. The increase of normal pressure and layer number enhances the interfacial friction anisotropy for graphene and <i>h</i>-BN but weakens that for MoSe<sub>2</sub>. Such significant deviations in the interfacial friction anisotropy of few-layer graphene, <i>h</i>-BN and MoSe<sub>2</sub> can be mainly attributed to the opposite contributions of electron kinetic energies and electrostatic energies to the sliding energy barriers and different interlayer charge exchanges. Our results deepen the understanding of the influence of external loading and thickness on the friction properties of 2D vdW crystals.
topic	two-dimensional crystals friction anisotropy pressure thickness first-principles calculations
url	https://www.mdpi.com/1996-1944/14/16/4717
work_keys_str_mv	AT kaibowang interfacialfrictionanisotropyinfewlayervanderwaalscrystals AT haoli interfacialfrictionanisotropyinfewlayervanderwaalscrystals AT yufengguo interfacialfrictionanisotropyinfewlayervanderwaalscrystals
_version_	1721191783985053696

Interfacial Friction Anisotropy in Few-Layer Van der Waals Crystals

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