We demonstrate 3D mechanical manipulations, such as sliding, rotating, folding, flipping, and exfoliating, of 2D materials using a microdome polymer (MDP) via in situ real-time observation with an optical microscope. A dimethylpolysiloxane (PDMS)-based MDP is covered with a poly(vinyl chloride) (PVC) adhesion layer. This PVC-MDP structure enables us to achieve small and adjustable contact areas between the PVC-MDP and a 2D-material flake, which is typically between ∼10 and ∼100 μm in diameter. The adhesion between the PVC polymer and 2D materials is fully tunable with temperature: Strong adhesion at ∼70 °C allows pick-up of the 2D material, and release occurs at ∼130 °C when the adhesion is weak. Thus the PVC-MDP functions as a point-of-contact manipulator for 2D materials, permitting the 3D manipulation of 2D-material flakes. Our method could facilitate the expansion of van der Waals heterostructure fabrication technology and the development of preparation techniques for more complex 3D structures.

中文翻译：

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使用Microdome聚合物对2D材料进行3D操纵

我们演示了使用Microdome聚合物（MDP）通过光学显微镜进行原位实时观察来演示2D材料的3D机械操作，例如滑动，旋转，折叠，翻转和剥落。基于二甲基聚硅氧烷（PDMS）的MDP上覆盖有聚（氯乙烯）（PVC）粘合层。这种PVC-MDP结构使我们能够在PVC-MDP与2D材料薄片之间实现较小且可调节的接触面积，该薄片的直径通常在10到100μm之间。PVC聚合物和2D材料之间的粘附力可随温度完全调节：在约70°C时具有很强的粘附力，可拾取2D材料，当粘附力较弱时，在约130°C时会释放。因此，PVC-MDP充当2D材料的接触点操纵器，从而可以对2D材料薄片进行3D处理。