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Dependence of Raman frequency down-shifts on applied strain. (A) rGO, (B) G-PCO, (C) πBG-V, and (D) SBG-V sheets. Optical images of the sheets at zero strain are in the upper right-hand corners. The images in the below left-hand corners show the spatial distribution of Raman frequencies. All images are of a 400-μm2 square area. The scale bar indicates the relationship between the color in the images and the Raman frequency.
