Stretchable Graphene: A Close Look at Fundamental Parameters through Biaxial Straining

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• 作者：Fei Ding ; Hengxing Ji ; Yonghai Chen ; Andreas Herklotz ; Kathrin Drr ; Yongfeng Mei ; Armando Rastelli ; Oliver G. Schmidt
• 刊名：Nano Letters
• 出版年：2010
• 出版时间：September 8, 2010
• 年：2010
• 卷：10
• 期：9
• 页码：3453-3458
• 全文大小：427K
• 年卷期：v.10,no.9(September 8, 2010)
• ISSN：1530-6992

文摘

Tunable biaxial stresses, both tensile and compressive, are applied to a single layer graphene by utilizing piezoelectric actuators. The Grneisen parameters for the phonons responsible for the D, G, 2D and 2D′ peaks are studied. The results show that the D peak is composed of two peaks, unambiguously revealing that the 2D peak frequency (ω_2D) is not exactly twice that of the D peak (ω_D). This finding is confirmed by varying the biaxial strain of the graphene, from which we observe that the shift of ω_2D/2 and ω_D are different. The employed technique allows a detailed study of the interplay between the graphene geometrical structures and its electronic properties.

Keywords:

Graphene; strain engineering; Grüneisen parameters; Raman spectroscopy; piezoelectric actuator