Physics Department, Free University, Berlin, Germany.
Nano Lett. 2012 Feb 8;12(2):617-21. doi: 10.1021/nl203359n. Epub 2012 Jan 5.
We use graphene bubbles to study the Raman spectrum of graphene under biaxial (e.g., isotropic) strain. Our Gruneisen parameters are in excellent agreement with the theoretical values. Discrepancy in the previously reported values is attributed to the interaction of graphene with the substrate. Bilayer balloons (intentionally pressurized membranes) have been used to avoid the effect of the substrate and to study the dependence of strain on the interlayer interactions.
我们使用石墨烯气泡来研究双轴（例如各向同性）应变下的石墨烯拉曼光谱。我们的 Grüneisen 参数与理论值非常吻合。之前报道的值存在差异，这归因于石墨烯与衬底的相互作用。我们使用双层气球（有意加压的薄膜）来避免衬底的影响，并研究应变对层间相互作用的依赖性。
