Figure 2: Sequential ADF images showing graphene from the step-edge of the BLG.
From: In situ observation of step-edge in-plane growth of graphene in a STEM
The initial 2nd-layer step-edge is indicated by dashed magenta line, while the rotated 2+-layer highlighted by cyan dot line shows different moiré patterns and increases over time. (a) Initial state (beam density is 0.09 × 109 e nm−2), (b) after beam scanning with a cumulative electron dose of 1.44 × 109 e nm−2, (c) after beam scanning with a cumulative electron dose of 1.98 × 109 e nm−2 and (d) after beam scanning with a cumulative electron dose of 3.87 × 109 e nm−2. The inset shows the Fourier transform images corresponding to the 1st (yellow rectangle), 2nd (green rectangle) and 2+ (red rectangle) layer of graphene. Blue arrows show the single Si atoms at step-edge and white arrow indicates the pinned Si atom. The sample is heated to 500 °C in TEM chamber. Scale bar, 0.5 nm.
