Atomic sawtooth-like metal films for vdW-layered single-crystal growthopen access
- Authors
- Ko, Hayoung; Choi, Soo Ho; Park, Yunjae; Lee, Seungjin; Oh, Chang Seok; Kim, Sung Youb; Lee, Young Hee; Kim, Soo Min; Ding, Feng; Kim, Ki Kang
- Issue Date
- Jul-2024
- Publisher
- NATURE PORTFOLIO
- Citation
- NATURE COMMUNICATIONS, v.15, no.1
- Journal Title
- NATURE COMMUNICATIONS
- Volume
- 15
- Number
- 1
- URI
- https://scholarworks.sookmyung.ac.kr/handle/2020.sw.sookmyung/160340
- DOI
- 10.1038/s41467-024-50184-5
- ISSN
- 2041-1723
2041-1723
- Abstract
- Atomic sawtooth surfaces have emerged as a versatile platform for growth of single-crystal van der Waals layered materials. However, the mechanism governing the formation of single-crystal atomic sawtooth metal (copper or gold) films on hard substrates (tungsten or molybdenum) remains a puzzle. In this study, we aim to elucidate the formation mechanism of atomic sawtooth metal films during melting-solidification process. Utilizing molecular dynamics, we unveil that the solidification of the liquid copper initiates at a high-index tungsten facet with higher interfacial energy. Subsequent tungsten facets follow energetically favourable pathways of forming single-crystal atomic sawtooth copper film during the solidification process near melting temperature. Formation of atomic sawtooth copper film is guaranteed with a film thickness exceeding the grain size of polycrystalline tungsten substrate. We further demonstrate the successful growth of centimeter-scale single-crystal monolayer hexagonal boron nitride films on atomic sawtooth copper films and explore their potential as efficient oxygen barrier. Although single-crystal (SC) 2D materials can be grown on atomic sawtooth metal surfaces, the formation mechanism during the melting-solidification process remains unclear. Here authors reveal that solidification starts at high-index facets and spreads, forming a SC atomic sawtooth surface.
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