An Introduction to Graphene

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An Introduction to Graphene ( an-introduction-graphene )

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(A) 0 9 Å 13 Å (a) 1 μm 4 (b) 3 2 1 0 (c) 0.5 1.0 1.5 2.0 0.5 1.0 1.5 2.0 0.5 1.0 1.5 2.0 Distance (μm) 10 1 An Introduction to Graphene (B) (a) (c) (b) (d) 2 nm (A) (a) AFM image of pristine single graphene sheet. The height which corresponds to the thickness of a single layer is 0.9 nm while a folded sheet is mea- sured at height of 1.3nm. (Reproduced with permission from [67].) (b) AFM image and height profile of a single GO layer. (Reproduced with permission from [20].) (c) height profile collected along the lines marked in black on the AFM micrograph. (B) TEM images of (a,b) pristine single graphene sheets. (Reproduced with permis- sion from [41].) (c) Aberration-corrected TEM image: grain boundary in a single graphene sheet. (Reproduced with permission from [68].) (d) HR-TEM of a graphene mono- layer produced by exfoliation of graphite in the presence of tiopronin as radical trap. (Reproduced with permission from [50].) Figure 1.5 individual carbon atoms can be distinguished. This image clearly indicates a single graphene sheet, as the AB stacking of a double sheet would lead to the presence of additional atoms in the center of the hexagons. The overview image shown in Figure 1.5B-d also indicates that adsorbents are likely to be present at the surface of the graphene layer giving rise to the ripple-like contrast present in this image. 4 3 2 1 0 4 3 2 1 0 0.0 0.0 0.0 Height (nm) Height (nm) Height (nm)

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