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<p>Molybdenum disulfide (MoS<sub>2</sub>) is a ubiquitous lubricant for use in outer space. Here, we present a MoS<sub>2</sub>/W nano-multilayer film engineered through precise structural optimization by fine-tuning sputtering parameters. This architecture, featuring alternating metallic W layers and highly oriented MoS<sub>2</sub> layers, restricts oxidation depth to less than 25 nm (2.7×10<sup>21</sup> atoms·cm<sup>−2</sup>)—just one-23rd of that observed in composite structure—outperforming previously reported space lubricants. Intriguingly, the metal oxide nanoparticles formed during atomic oxygen irradiation further reduce friction, enabling robust superlubricity with a friction coefficient of ~0.008. Our approach, bolstered by theoretical calculations and experiments, elucidates that this achievement is facilitated by the dual strengthening of the nano-multilayer structure and the in-situ generation of high-concentration, small-sized oxide nanoparticles at the contact interface. These findings provide invaluable insights into the design of irradiation-resistant and durable lubricating materials for space applications.</p>

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Enhancing irradiation tolerance and inducing superlubricity in MoS2/W multilayer film exposed to atomic oxygen

  • 期刊论文

  • 出版模式：

    开放获取

  • 发表日期：

    2025年7月23日

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  • Xin Fan,
  • Wenhao He,
  • Zhenao Zhang,
  • Bo He,
  • Yanwen Lin,
  • Qinsheng He,
  • Liang-Feng Huang,
  • Siming Ren,
  • Zhibin Lu,
  • Jibin Pu,
  • Qunji Xue

摘要

Molybdenum disulfide (MoS2) is a ubiquitous lubricant for use in outer space. Here, we present a MoS2/W nano-multilayer film engineered through precise structural optimization by fine-tuning sputtering parameters. This architecture, featuring alternating metallic W layers and highly oriented MoS2 layers, restricts oxidation depth to less than 25 nm (2.7×1021 atoms·cm−2)—just one-23rd of that observed in composite structure—outperforming previously reported space lubricants. Intriguingly, the metal oxide nanoparticles formed during atomic oxygen irradiation further reduce friction, enabling robust superlubricity with a friction coefficient of ~0.008. Our approach, bolstered by theoretical calculations and experiments, elucidates that this achievement is facilitated by the dual strengthening of the nano-multilayer structure and the in-situ generation of high-concentration, small-sized oxide nanoparticles at the contact interface. These findings provide invaluable insights into the design of irradiation-resistant and durable lubricating materials for space applications.