Chlorinated Poly(vinyl chloride) Stamps with High Adhesion for Origami Folding of 2D Materials

We demonstrate that a chlorinated poly(vinyl chloride) (CPVC) film containing a high-viscosity plasticizer enables stable three-dimensional (3D) manipulation of two-dimensional materials, including atomic-layer origami. In clear contrast to conventional PVC films, the CPVC film prevents flake detachment and allows precise control of folding, realizing diverse 3D morphologies such as multiply and corrugated structures. To clarify why CPVC outperforms PVC, we quantitatively investigated adhesion behavior using adhesive force measurements during tensile detachment. The CPVC film exhibits both strong initial adhesion and a long adhesion-sustaining distance, characteristics that correlate directly with reliable folding operations. This study establishes a framework linking measurable adhesion properties to manipulation performance, providing rational guidelines for stamp material design and advancing high-precision techniques for transfer, stacking, and folding.