石墨烯
材料科学
位错
凝聚态物理
部分位错
格子(音乐)
延伸率
位错蠕变
分子动力学
结晶学
复合材料
纳米技术
物理
极限抗拉强度
化学
计算化学
声学
作者
Jamie H. Warner,Elena R. Margine,Masakazu Mukai,Alex W. Robertson,Feliciano Giustino,Angus I. Kirkland
出处
期刊:Science
[American Association for the Advancement of Science (AAAS)]
日期:2012-07-13
卷期号:337 (6091): 209-212
被引量:336
标识
DOI:10.1126/science.1217529
摘要
The movement of dislocations in a crystal is the key mechanism for plastic deformation in all materials. Studies of dislocations have focused on three-dimensional materials, and there is little experimental evidence regarding the dynamics of dislocations and their impact at the atomic level on the lattice structure of graphene. We studied the dynamics of dislocation pairs in graphene, recorded with single-atom sensitivity. We examined stepwise dislocation movement along the zig-zag lattice direction mediated either by a single bond rotation or through the loss of two carbon atoms. The strain fields were determined, showing how dislocations deform graphene by elongation and compression of C-C bonds, shear, and lattice rotations.
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