Physics – Condensed Matter – Materials Science
Scientific paper
2010-12-14
Physics
Condensed Matter
Materials Science
21 pages, 6 figure, accepted by ACS Nano
Scientific paper
In this report, we present Raman spectroscopy investigation of the thermal stability and dynamics of graphene edges. It was found that graphene edges (both armchair and zigzag) are not stable and undergo modifications even at temperature as low as 200{\deg}C. Based on polarized Raman results, we provide possible structural models on how graphene edges change during annealing. The zigzag edges rearrange and form armchair segments that are \pm30{\deg} relative to the edge direction, while armchair edges are dominated by armchair segments even at annealing temperature as high as 500{\deg}C. The modifications of edge structures by thermal annealing (zigzag segments rearrange in form of armchair segments) provide a flexible way to control the electronic properties of graphene and graphene nanostructures.
Liu Lei
Nguyen Thuong Thuong
Ni Zhen Hua
Shen Ze Xiang
Suo Hui
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