STS near an edge of graphene nanoisland. (a) Atomic resolution CC-STM image of top-left side of the island in Figure 1b (V
= − 0.05 V, Iset = 1 nA). The hexagons denote the honeycomb lattice structure of G. (b) STS spectra measured at nine positions along the line AB across the G edge towards the Ir region. The inset shows the dI/dV signal height at V
= − 1.0 V as a function of distance from the edge. The dI/dV signal decreases from the position of approximately 1.0 nm inside the island towards the edge.