Journal Highlight: The thermal stability of graphene in air investigated by Raman spectroscopy

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The thermal stability of graphene in air investigated by Raman spectroscopy

Journal of Raman Spectroscopy, 2013, 44, 1018-1021
Hai Yan Nan, Zhen Hua Ni, Jun Wang, Zainab Zafar, Zhi Xiang Shi, Ying Ying Wang

Abstract: The thermal stability in air of graphene synthesized by either chemical vapor deposition or mechanical cleavage is studied. It is found that single layer graphene prepared by both methods starts to show defects at ~500 °C, indicated by the appearance of a disorder-induced Raman D peak. The defects are initially sp³ type and become vacancy like at higher temperature. On the other hand, bilayer graphene shows better thermal stability, and the D peak appears at ~600 °C. These results are quite different from those annealing in vacuum and controlled atmosphere. Raman images show that the defects in chemical vapor deposition graphene are not homogeneous, whereas those in mechanical cleavage graphene are uniformly distributed across the whole sample. The factors that affect the thermal stability of graphene are discussed. Our results could be important for guiding the future electronics process and chemical decoration of graphene.

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