ArticleProceedings of the National Academy of Sciences of the United States of America2024
Wear-free sliding electrical contacts with ultralow electrical resistivity.
Article in Proceedings of the National Academy of Sciences of the United States of America, 2024. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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4 citing papers in PubMed.
- Robust structural superlubric interfaces under high current density, from understandings to applications.Microsystems & nanoengineering · 2026Article
- Strong yet highly conductive liquid metal composite film constructed via friction induced in-situ synthesis.Nature communications · 2026Article
- 2D Nanomaterials Toward Function-Ready Superlubricity in Advanced Microsystems.Advanced materials (Deerfield Beach, Fla.) · 2026Review
- Wear-free sliding electrical contacts with ultralow electrical resistivity.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
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8 authors.
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Abstract
Sliding electrical contacts are commonly applied in electrical connectors, such as conductive slip rings, pantographs, switches, and commutators. However, they suffer from several unavoidable problems caused by friction and wear, including high energy consumption, intermittent failures, limited life, and even failure disasters. In this study, we realized an ultralow-friction and long-distance wear-free state, defined as structural superlubricity (SSL), between sliding electrical interfaces under ambient conditions. A conductive SSL can be implemented in experiments with single-crystal graphite flakes on flattened metals, such as Au and Ni films. Furthermore, we found that depositing a 2 to 3-nm-thick diamond-like carbon (DLC) film on a nickel alloy can lead to an even lower resistivity than that of metals alone. In addition, we revealed the mechanism by which DLC films can improve the conductivity between graphite and metals through density functional-theory simulations. In addition, we prepared a prototype of the SSL slip ring and proved that it possessed ultralow friction, was wear-free, and had no intermittent failures. Consequently, our results demonstrate a unique type of electrical-contact interface for applications requiring conduction while sliding. Thus, we opened the door for SSL electromechanical coupling.
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