Chemistry Reference
In-Depth Information
Fig. 11 STM images of Au deposits on (a) 3 ML and (b) 8 ML MgO/Ag (001) (30
30 nm
2
).
Due to the charge-mediated adhesion, Au wets the ultrathin MgO film. In the case of thicker films,
the electron transfer is inhibited and 3D gold particles form on the oxide surface [
15
]
Fig. 12 (a) STM topographic image and (b) dI/dV maps of a planar Au island on 2 ML MgO/Ag
(001) taken at the indicated bias voltage (US
25 nm
2
). (c) Corresponding charge
distribution as calculated with a Density Functional Tight Binding approach [
57
]
ΒΌ
0.2 V, 25
mutual distance, which promotes their localization along the island edges. The
presence of a negatively charged perimeter can be deduced directly from STM
conductance maps of the 2D Au islands, as shown in Fig.
12
. Especially around the
Fermi level, the island edges appear with enhanced dI/dV contrast, indicating a
