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Nucleation, growth and sintering of Pd deposited on an ultra-thin silica film were studied by scanning tunneling microscopy and infrared reflection absorption spectroscopy. No preferential nucleation of Pd on the silica surface was observed both at 90 and 300K deposition. When adsorbed on Pd clusters formed at 90K, CO causes a strong sintering effect even at this temperature. The results are rationalized...
We have investigated the oxidation behavior of Pd nanoparticles grown epitaxially on MgO(100) single crystal substrates. We find that the interaction of oxygen with octahedral Pd nanoparticles at 500K can be subdivided in three stages: above 10 −6 mbar O 2 pressure, the particles start to flatten; above 10 −3 mbar, the particles begin to shrink laterally and to be less truncated...
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