Fast growth of centimeter-scale single-crystal copper foils with high-index planes by the edge-incision effect: 2d Materials

L. Li, T. Ma, W. Yu, M. L. Zhu, J. Li, Z. Chen, H. H. Li, M. Zhao, J. H. Teng, B. B. Tian, C. L. Su, K. P. Loh

Research output: Journal article publicationJournal articleAcademic researchpeer-review

Abstract

Single-crystal copper substrates have gained importance for the preparation of high-quality graphene and hexagonal boron nitride monolayer films by chemical vapor deposition (CVD). Especially, large-scale single-crystal copper foils with high-index planes are synthesized recently and attract great interests. However, the current synthesis methods of single-crystal copper foils and films are energy and time-consuming. Here, we show a rapid and efficient approach for the preparation of centimeter-scale single-crystal copper foils by making small incisions at the edges of polycrystalline copper foils before high-temperature annealing. 1.5 cm x 4 cm pieces of grain-boundary-free copper foils can be prepared by annealing at 1080 degrees C for 60 min. The annealed copper foil manifests a single high-index plane and is grain-boundary-free over the whole area. We also show that CVD of graphene on the high-index single-crystal copper affords a higher growth rate than on low-index copper substrates.
Original languageEnglish
Journal2D Materials
Volume8
Issue number3
DOIs
Publication statusPublished - Apr 2021

Keywords

  • single-crystal copper foils high-index planes abnormal grain growth incisions high-temperature annealing graphene

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