Inertness of the cleaved (0001) surface of the Bi2Se3 single crystal, grown by modified Bridgman method, to oxidation has been demonstrated by X-ray photoelectron spectroscopy, scanning tunneling microscopy, and by ab initio DFT calculations. No intrinsic bismuth and selenium oxides are formed on the low-defect, atomically flat Bi2Se3(0001)-(1×1) surface after a long-time air exposure. The inertness of Bi2Se3(0001) to O2 and NO2, as well as bismuth-oxygen bonding formation under molecular adsorption in the Se vacancy was supported by DFT calculations.
The reactions of the platinum and rhodium model catalysts applied to aluminum oxide with NO x (10 Torr NO + 10 Torr O 2 ) were studied by X-ray photoelectron spectroscopy. The reaction conducted at room temperature formed on the surface of the oxide support the
The interaction of the model catalysts with NO x (mixture of 10 Torr of NO and 10 Torr of O 2 ) was studied by X ray photoelectron spectroscopy (XPS). Sam ples of the model catalysts were prepared under vacuum conditions as oxide films ≥100 Å in thickness on tan talum foil with evaporated platinum group metal particles. According to transmission electron microscopic data, the platinum group metal particle size was several nanometers. It was found by XPS that the oxidation of Rh and Pd nanoparticles in their interaction with NO x occurs already at room temperature. The particles of platinum were more stable: their oxidation under the action of NO x was observed at elevated temperatures of ~300°C. At room temperature, the interaction of platinum nanoparticles with NO x hypothetically leads to the dissolution (insertion) of oxygen atoms in the bulk of the particles with the retention of their metallic nature. It was found that dissolved oxygen is much more readily reducible by hydrogen than the lattice oxygen of the platinum oxide particles.
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