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The Nanoparticle Size Effect in Graphene Cutting: A “Pac‐Man” Mechanism
Author(s) -
Qiu Zongyang,
Song Li,
Zhao Jin,
Li Zhenyu,
Yang Jinlong
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201602541
Subject(s) - graphene , nanoparticle , materials science , zigzag , etching (microfabrication) , carbon fibers , nanotechnology , enhanced data rates for gsm evolution , metal , chemical physics , chemical engineering , composite material , chemistry , geometry , computer science , metallurgy , telecommunications , mathematics , layer (electronics) , composite number , engineering
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.