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SEM, TEM, and SAED images. (a–c) Left-side images are from untreated commercial Au Quantifoil grids. (d–f) Middle-column images are from PMMA/graphene-coated Au Quantifoil grids. (g–i) Right-side images are PMMA-free graphene grids after rinsing/baking steps. (a, d, g) Scale bars in SEM images represent 50 μm. (b, e, h) Scale bars in TEM images represent 400 nm. (c, f, i) Scale bars in SAED images represent 5 nm–1.
