On the right severe delamination of graphene caused by resist (blue) removal. With metal mask no delamination occurs as shown on left (scale bar represents 10 μm). The inset shows typical Raman spectrum of etched graphene, note the smaller barely noticeable D peak (approx. 1350 cm-1) compared to Figure 1.
Kumar et al. Nanoscale Research Letters 2011 6:390 doi:10.1186/1556-276X-6-390