Superlubricity of Sputtered MoS2 Film in Dry Air Enabled by Proton Irradiation

IF 2.9 3区工程技术 Q2 ENGINEERING, CHEMICAL

Tribology Letters Pub Date : 2024-11-18 DOI:10.1007/s11249-024-01938-1

Xinhu Wu, Yongfu Wang, Kuiliang Gong, Gaiqing Zhao, Xudong Sui, Xiaobo Wang

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引用次数: 0

Abstract

The superlubricity of sputtered MoS₂ film under dry air environment was achieved by low-energy proton irradiation of 25 keV for the first time. We found that proton (H⁺) irradiation is able to break the Mo-S covalent bonding of as-deposited MoS₂ film and leads to the formation of MoS₂ nanocrystalline domains. The dangling bonds at edge planes or newly exposed edges could be passivated with hydrogen ions by bonding interaction under proton irradiation, forming hydric MoS₂ nanocrystalline domains with stable S–H bind, resulting in superior antioxidant capacity of proton-irradiated MoS₂ film compared to its non-irradiated counterpart. Importantly, proton irradiation can penetrate the interior of sputtered MoS₂ film with thickness over 1 µm and restructure the as-deposited MoS₂ film into nanocrystalline MoS₂ domains to achieve superlubricity and life extension under dry air conditions.

Graphical abstract

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通过质子辐照实现干燥空气中溅射 MoS2 薄膜的超润滑性

通过 25 keV 的低能质子辐照，首次实现了干燥空气环境下溅射 MoS2 薄膜的超润滑性。我们发现，质子（H+）辐照能够破坏沉积 MoS2 薄膜的 Mo-S 共价键，并导致 MoS2 纳米晶域的形成。在质子辐照下，边缘平面或新暴露边缘的悬空键可通过键合作用与氢离子钝化，形成具有稳定 S-H 结合的水合 MoS2 纳米晶域，从而使质子辐照 MoS2 膜的抗氧化能力优于未辐照膜。重要的是，质子辐照可穿透厚度超过 1 µm 的溅射 MoS2 薄膜内部，并将沉积的 MoS2 薄膜重组为纳米晶 MoS2 域，从而在干燥空气条件下实现超润滑和延长寿命。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Tribology Letters 工程技术-工程：化工

CiteScore

5.30

自引率

9.40%

发文量

116

审稿时长

2.5 months

期刊介绍： Tribology Letters is devoted to the development of the science of tribology and its applications, particularly focusing on publishing high-quality papers at the forefront of tribological science and that address the fundamentals of friction, lubrication, wear, or adhesion. The journal facilitates communication and exchange of seminal ideas among thousands of practitioners who are engaged worldwide in the pursuit of tribology-based science and technology.