原子完美撕裂的石墨烯边缘及其可逆重构
Atomically perfect torn graphene edges and their reversible reconstruction
摘要：
石墨烯边缘的原子结构在确定截短的石墨烯结构（特别是纳米带）的电、磁和化学性质方面是关键的。不幸的是，石墨烯边缘通常远非理想，并且遭受原子级缺陷、结构扭曲和非预期的化学官能化，导致不可预测的性质。在这里，我们报告说，在高真空中通过电子束引发的机械破裂或撕裂制造的石墨烯边缘是干净的，在很大程度上是原子上完美的，在扶手椅或Z字形方向取向。通过像差校正的透射电子显微镜，我们证明了可逆的和扩展的五边形-七边形（5-7）在锯齿形边缘重建，并从实验和理论上探索配置状态之间的转换的动力学。在5-7和6-6锯齿边缘态之间的翻转率的理论和实验结果吻合较好。我们的研究表明，简单的撕裂是非常有效的生产原子清洁，理想的终端，从而提供了一个有价值的工具，实现原子定制的石墨烯和促进有意义的实验研究。
英文摘要：
The atomic structure of graphene edges is critical in determining the electrical, magnetic, and chemical properties of truncated graphene structures, notably nanoribbons. Unfortunately, graphene edges are typically far from ideal and suffer from atomic-scale defects, structural distortion, and unintended chemical functionalization, leading to unpredictable properties. Here we report that graphene edges fabricated by electron-beam-initiated mechanical rupture or tearing in high vacuum are clean and largely atomically perfect, oriented in either the armchair or zigzag direction. Via aberration-corrected transmission electron microscopy, we demonstrate reversible and extended pentagon-heptagon (5-7) reconstruction at zigzag edges, and explore experimentally and theoretically the dynamics of the transitions between configuration states. Good theoretical-experimental agreement is found for the flipping rates between 5-7 and 6-6 zigzag edge states. Our study demonstrates that simple ripping is remarkably effective in producing atomically clean, ideal terminations thus providing a valuable tool for realizing atomically-tailored graphene and facilitating meaningful experimental study.
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