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Two-dimensional (2D) materials have attracted significant interest for their unique structures and properties. While introducing wrinkles effectively modulates these properties, fabricating high-density wrinkles on a large scale remains challenging. Here, we develop a strategy utilizing reversed phase transitions in liquid metals to achieve a high-fidelity transfer and efficient wrinkling of 2D materials. During Ga solidification, the large-area transfer of 2D layers is accomplished via substrate adhesion. Subsequent Ga melting induces synergistic substrate shrinkage and strain redistribution in MoS2, generating wrinkles with large coverage (>22,000 μm2) and high density (∼6.3 μm–1). As an application example, wrinkled MoS2 produced via this approach serves as a surface-enhanced Raman scattering substrate, which detects Rhodamine 6G, with the limit of detection being 3 orders of magnitude lower than that of flat MoS2. This work develops a platform for designing 2D material wrinkle structures, opening avenues to tailor their functional properties.
Zhang et al. (Mon,) studied this question.