Ultralow Interlayer Friction of Layered Electride Ca2N: A Potential Two-Dimensional Solid Lubricant Material

Wang, Jianjun; Shen, Ziting; Guo, Peng; Li, Meng; Zhao, Bin; Fang, Lili; Yang, Lei

doi:10.3390/ma11122462

Cited by 17 publications

(11 citation statements)

References 36 publications

(70 reference statements)

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“…Two research groups [712,713] have studied the frictional properties of Mxenes, a 2D material which has recently aroused widespread interest, proving that they are promising lubricating materials with low and controllable sliding energy barrier and excellent mechanical properties. Another kind of 2D material, layered electride Ca 2 N, has also been found to be a potential solid lubricant, exhibiting strong interlayer binding interactions but low interlayer friction due to the homogeneous conduction electrons distribution [714].…”

Section: First Principle Computationsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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The reach of tribology has expanded in diverse fields and tribology related research activities have seen immense growth during the last decade. This review takes stock of the recent advances in research pertaining to different aspects of tribology within the last 2 to 3 years. Different aspects of tribology that have been reviewed including lubrication, wear and surface engineering, biotribology, high temperature tribology, and computational tribology. This review attempts to highlight recent research and also presents future outlook pertaining to these aspects. It may however be noted that there are limitations of this review. One of the most important of these is that tribology being a highly multidisciplinary field, the research results are widely spread across various disciplines and there can be omissions because of this. Secondly, the topics dealt with in the field of tribology include only some of the salient topics (such as lubrication, wear, surface engineering, biotribology, high temperature tribology, and computational tribology) but there are many more aspects of tribology that have not been covered in this review. Despite these limitations it is hoped that such a review will bring the most recent salient research in focus and will be beneficial for the growing community of tribology researchers.

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Section: First Principle Computationsmentioning

confidence: 99%

A review of recent advances in tribology

et al. 2020

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“…The complete screening of the cationic layers by anionic electrons is suggested to explain the insensitivity of the electronic structure to stacking/sliding. The interlayer sliding of Ca 2 N has also been studied by Wang et al, [ 129 ] who pointed out that Ca 2 N has a larger interlayer binding energy but a lower interlayer friction than van der Waals‐bonded layered materials, such as graphite, h‐BN, and MoS 2 .…”

Section: Miscellaneous Properties Of 2d Electrides and Electrenesmentioning

confidence: 96%

Floating Interlayer and Surface Electrons in 2D Materials: Graphite, Electrides, and Electrenes

2021

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Over the last half century, layered materials have been at the forefront of materials science, spearheading the discovery of new phenomena and functionalities. Certain layered materials are known to possess electronic states unassociated with any of the constituent atoms, having a large proportion of their probability amplitude in the space between the layers. Usually, such a nucleus‐free interlayer state has energy above the Fermi level and is unoccupied. However, the energy decreases when cations are intercalated and may cross the Fermi level, as in the case of C6Ca, a superconductor with a Tc of 11.5 K. A major thrust to the research of interlayer electrons comes with the discovery of layered electrides, which are alternating stacks of positively charged ionic layers and negatively charged sheets of electrons in the interlayer space. When intercalation compounds and layered electrides are thinned down to the atomic scale, the interlayer states survive as surface states floating over the surface. This review provides a unified overview of the two classes of materials hosting interlayer floating electrons near the Fermi level, intercalation compounds and layered electrides, and their properties, including high electron mobility, low work function, ultralow interlayer friction, superconductivity, and plasmonic properties.

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“…The vdW strength of two contacting structures is a key requirement for lubricity/superlubricity behaviour. 5 Currently, only a few Van der Waals structures, graphite, boron nitride and molybdenum disulfide, are used as dry lubricants. However, it is possible to theoretically identify 6,138 single layer 2D materials, available from an online database (https://2dmatpedia.org/), obtained by theoretical exfoliation and elemental substitution from a large number of inorganic bulk structures included in the database Materials Project (https://materialsproject.org/).…”

Section: Mainmentioning

confidence: 99%

Impressive computational acceleration by using machine learning for 2-dimensional super-lubricant materials discovery

Fronzi,

Ghazaleh,

Isayev

et al. 2019

Preprint

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Ultralow Interlayer Friction of Layered Electride Ca2N: A Potential Two-Dimensional Solid Lubricant Material

Cited by 17 publications

References 36 publications

A review of recent advances in tribology

A review of recent advances in tribology

Floating Interlayer and Surface Electrons in 2D Materials: Graphite, Electrides, and Electrenes

Impressive computational acceleration by using machine learning for 2-dimensional super-lubricant materials discovery

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