Stretchable Graphene: A Close Look at Fundamental Parameters through Biaxial Straining
Stretchable Graphene: A Close Look at Fundamental Parameters through Biaxial Straining
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DOI：
10.1021/nl101533x
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发表时间：
2010-09-01
期刊：
影响因子：
10.8
通讯作者：
Schmidt, Oliver G.
中科院分区：
文献类型：
--
作者：
Ding, Fei;Ji, Hengxing;Schmidt, Oliver G.
可调双轴应力，拉伸和压缩，施加到单层石墨烯通过利用压电致动器。研究了D、G、2D和2D'峰的声子的Gruneisen参数。结果表明，D峰由两个峰组成，明确揭示了2D峰频率（ω（2D））不是D峰频率（ω（D））的两倍。通过改变石墨烯的双轴应变证实了这一发现，从中我们观察到ω（2D）/2和ω（D）的位移是不同的。所采用的技术允许详细研究石墨烯几何结构和其电子性质之间的相互作用。
Tunable biaxial stresses, both tensile and compressive, are applied to a single layer graphene by utilizing piezoelectric actuators. The Gruneisen 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 (omega(2D)) is not exactly twice that of the D peak (omega(D)). This finding is confirmed by varying the biaxial strain of the graphene, from which we observe that the shift of omega(2D)/2 and omega(D) are different. The employed technique allows a detailed study of the interplay between the graphene geometrical structures and its electronic properties.