The Nanoparticle Size Effect in Graphene Cutting: A “Pac-Man” Mechanism

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• 作者：Zongyang Qiu ; Prof. Li Song ; Prof. Jin Zhao ; Prof. Zhenyu Li and Prof. Jinlong Yang
• 刊名：Angewandte Chemie International Edition
• 出版年：2016
• 出版时间：August 16, 2016
• 年：2016
• 卷：55
• 期：34
• 页码：9918-9921
• 全文大小：2701K
• ISSN：1521-3773

文摘

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.