期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 55, 期 34, 页码 9918-9921出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.201602541
关键词
density functional calculations; graphene; multiscale simulations; nanoparticles; nickel
资金
- NSFC [21421063, 21573201]
- MOST [2014CB932700]
- CAS [XDB01020300]
- CUSF
- NSFC-Guangdong Joint Fund
- USTC-SCC, SCCAS, Tianjin
- Shanghai Supercomputer Centers
Metal-nanoparticle-catalyzed cutting is a promising way to produce graphene nanostructures with smooth and well-aligned edges. Using a multiscale simulation approach, we unambiguously identified a Pac-Man cutting mechanism, characterized by the metal nanoparticle biting off edge carbon atoms through a synergetic effect of multiple metal atoms. By comparing the reaction rates at different types of edge sites, we found that etching of an entire edge carbon row could be triggered by a single zigzag-site etching event, which explains the puzzling linear dependence of the overall carbon-atom etching rate on the nanoparticle surface area observed experimentally. With incorporation of the nanoparticle size effect, the mechanisms revealed herein open a new avenue to improve controllability in graphene cutting.
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