石墨烯
富勒烯
化学
石墨
碳纤维
石墨烯纳米带
化学物理
产量(工程)
纳米技术
材料科学
有机化学
复合材料
复合数
作者
Andrey Chuvilin,Ute Kaiser,Elena Bichoutskaia,Nicholas A. Besley,Andrei N. Khlobystov
出处
期刊:Nature Chemistry
[Springer Nature]
日期:2010-05-09
卷期号:2 (6): 450-453
被引量:351
摘要
Although fullerenes can be efficiently generated from graphite in high yield, the route to the formation of these symmetrical and aesthetically pleasing carbon cages from a flat graphene sheet remains a mystery. The most widely accepted mechanisms postulate that the graphene structure dissociates to very small clusters of carbon atoms such as C(2), which subsequently coalesce to form fullerene cages through a series of intermediates. In this Article, aberration-corrected transmission electron microscopy directly visualizes, in real time, a process of fullerene formation from a graphene sheet. Quantum chemical modelling explains four critical steps in a top-down mechanism of fullerene formation: (i) loss of carbon atoms at the edge of graphene, leading to (ii) the formation of pentagons, which (iii) triggers the curving of graphene into a bowl-shaped structure and which (iv) subsequently zips up its open edges to form a closed fullerene structure.
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