Liquid metals (LMs) are a special case of metals that exist in a liquid at room temperature, making them one of the most attractive conductive materials in stretchable electronics. In many cases, however, the LM attacks other metals in contact with the LM through penetration, embrittlement, and alloying. To address these critical issues, there have been efforts to introduce robust barriers, which can preserve the underlying metals without degradation. For example, graphene is employed as a flexible barrier owing to its chemical inertness and impermeability. Nevertheless, this material is difficult to utilize in stretchable electronics because its defects result in inevitable fracture, even at a low strain (< 6%). In addition, it is a challenge to pattern the graphene layer on the point‐of‐interest area in a facile manner. Herein, it is shown that the insertion of single‐walled carbon nanotubes (SWCNTs) at the liquid metal–solid metal interface provides a proper barrier for LM under large deformation conditions. A tangled 1D structure of the SWCNTs formed from a solution process greatly suppresses the crack generation/propagation and maintains conductivity even under large strains, which facilitates the use of SWCNTs as stretchable barriers with long‐term reliability through the introduction of a corrugated structure.

中文翻译：

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高度可靠的液态金属–固态金属触点，带有波纹单壁碳纳米管扩散壁垒，用于可拉伸电子设备

液态金属（LM）是在室温下存在于液体中的金属的特例，使其成为可拉伸电子产品中最具吸引力的导电材料之一。但是，在许多情况下，LM会通过渗透，脆化和合金化作用而与LM接触而腐蚀其他金属。为了解决这些关键问题，一直在努力引入坚固的壁垒，该壁垒可以保护基础金属而不会降解。例如，石墨烯由于其化学惰性和不渗透性而被用作柔性屏障。然而，由于这种材料的缺陷会导致不可避免的断裂，即使在低应变（<6％）的情况下，这种材料也很难在可拉伸电子产品中使用。此外，以便捷的方式在兴趣点区域上构图石墨烯层也是一个挑战。在此处，结果表明，在液态金属-固态金属界面处插入单壁碳纳米管（SWCNT）为LM在大变形条件下提供了适当的屏障。由固溶过程形成的单壁碳纳米管的纠结一维结构即使在大应变下也能极大地抑制裂纹的产生/传播并保持导电性，这有利于通过引入波纹状结构将单壁碳纳米管用作具有长期可靠性的可拉伸阻隔层。