Abstract
Metallurgy Single-crystal metal foils are valuable for their surface properties that allow for synthesis of materials like graphene. Jin et al. present a strategy for creating colossal single-crystal metal foils called “contact-free annealing” (see the Perspective by Rollett). The method relies on hanging and heating commercially available, inexpensive, cold-rolled metal foils. Almost as if by magic, the polycrystalline grains rotate and anneal into a large single-crystal sheet with a specific crystal orientation. The strategy allows for the creation of much larger and much cheaper single-crystal metal foils. Science , this issue p. [1021][1]; see also p. [996][2] [1]: /lookup/doi/10.1126/science.aao3373 [2]: /lookup/doi/10.1126/science.aav6733
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