AC/AB Stacking Boundaries in Bilayer Graphene

作者：Lin Junhao; Fang Wenjing; Zhou Wu^*; Lupini Andrew R; Idrobo Juan Carlos; Kong Jing; Pennycook Stephen J; Pantelides Sokrates T

来源：Nano Letters, 2013, 13(7): 3262-3268.

DOI：10.1021/nl4013979

• Bilayer graphene
• stacking boundary
• dark-field TEM
• STEM imaging
• density functional theory
• classical molecular dynamics

Boundaries, including phase boundaries, grain boundaries, and domain boundaries, are known to have an important influence on material properties. Here, dark-field (DF) transmission electron microscopy (TEM) and scanning transmission electron microscopy (STEM) imaging are combined to provide a full view of boundaries between AB and AC stacking domains in bilayer graphene across length scales from discrete atoms to the macroscopic continuum. Combining the images with results obtained by density functional theory (DFT) and classical molecular dynamics calculations, we demonstrate that the AB/AC stacking boundaries in bilayer graphene are nanometer-wide strained channels, mostly in the form of ripples, producing smooth low-energy transitions between the two different stackings. Our results provide a new understanding of the novel stacking boundaries in bilayer graphene, which may be applied to other layered two-dimensional materials as well.

• 出版日期2013-7