纳米级相分离层状 CuInP2S6 的非均匀摩擦行为,Advanced Functional Materials

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纳米级相分离层状 CuInP2S6 的非均匀摩擦行为
Advanced Functional Materials ( IF 18.5 ) Pub Date : 2023-05-24 , DOI: 10.1002/adfm.202303583
Lei Wang ₁ , Dawei Zhang _{1,

2} , Zheng‐Dong Luo _{3,

4} , Pankaj Sharma _{1,

2,

5} , Jan Seidel _{1,

2}

Affiliation

机械摩擦会导致磨损和能量耗散，其控制在新一代微型机电设备中非常重要。石墨烯等二维材料由于其超低摩擦而被认为是优异的固体润滑剂，并引起了广泛的研究兴趣。在各种其他二维材料中也发现了独特的摩擦特性。然而，在新型纳米电子学中具有潜在应用的功能性范德华材料（如铁电铜铟硫代磷酸盐）的摩擦却几乎没有被研究过。在此，该研究报告了在缺铜的CuInP ₂ S ₆ (Cu _0.2 In _1.26 P ₂ S)中观察到的不均匀摩擦行为。₆ )，其表现出极性和非极性晶相的纳米级相分离。顺电 In _4/3 P ₂ S ₆相比铁电 CuInP ₂ S _{6相表现出更高的摩擦力}有趣的是，两相之间的相边界显示出最低的摩擦力。这种现象的根源在于不同的相晶格应变以及纳米级相边界处存在大应变，这也体现在不均匀的尖端-样品粘附力上。这些发现为纳米级器件设计和相分离范德华铁电体的磨损行为提供了新的见解，这可能有助于降低摩擦器件的功耗并延长其使用寿命。

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Inhomogeneous Friction Behaviour of Nanoscale Phase Separated Layered CuInP2S6

Mechanical friction leads to wear and energy dissipation, and its control is of high importance in new-generation miniature electromechanical devices. 2D materials such as graphene are considered to be excellent solid lubricants due to their ultralow friction and have attracted considerable research interest. Unique friction properties are discovered in various other 2D materials. However, the friction of functional van der Waals materials which have potential applications in novel nanoelectronics, like ferroelectric copper indium thiophosphate, has barely been studied. Herein, the study reports on the observation of inhomogeneous friction behavior existing in copper-deficient CuInP₂S₆ (Cu_0.2In_1.26P₂S₆), which exhibits a nanoscale phase separation of polar and non-polar crystalline phases. The paraelectric In_4/3P₂S₆ phase exhibits higher friction than the ferroelectric CuInP₂S₆ phase, while phase boundaries between the two phases, interestingly, display the lowest friction. The origin of this phenomenon is attributed to different lattice strains of phases together with the presence of large strains at the nanoscale phase boundaries, which also manifests in the nonuniform tip-sample adhesion force. The findings provide new insights into nanoscale device design and wear behavior of a phase-separated van der Waals ferroelectric, which may help to reduce the power consumption of friction-exhibiting devices and extend their service life.

更新日期：2023-05-24

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