Chemistry Reference
In-Depth Information
Fig. 30 Au 4f (a) and Cl 2p (b) photoemission spectra from an Au-Fe
3
O
4
(111) sample at different
stages of preparation (from top to bottom: “as deposited” is after drying, “rinsed” is after rinsing
with distilled water, “annealed” is after additional heating to 600 K in UHV). (c) STM image
(150
150 nm) of the annealed Au-Fe
3
O
4
(111) sample prepared via aqueous Au precursor.
(d) STM image (150
150 nm) of an annealed Au-Fe
3
O
4
(111) sample prepared by physical
vapor deposition of Au in UHV
deposition of Au in UHV followed by annealing to 600 K. In this case, the Au
particles are homogeneously distributed over the entire surface and the particle size
distribution is narrow.
The chemical complexity of the system as well as the different interaction of Au
with the chemically modified substrate is most probably responsible for the more
heterogeneous Au particle distribution and morphology on the Au-Fe
3
O
4
(111)
