56 research outputs found
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Synthesis of TiO2 Nanoparticles on the Au(111) Surface
The growth of titanium oxide nanoparticles on reconstructed Au(111) surfaces was investigated by scanning tunneling microscopy and X-ray photoelectron spectroscopy. Ti was deposited by physical vapor deposition at 300 K. Regular arrays of titanium nanoparticles form by preferential nucleation of Ti at the elbow sites of the herringbone reconstruction. Titanium oxide clusters were synthesized by subsequent exposure to O{sub 2} at 300 K. Two- and three-dimensional titanium oxide nanocrystallites form during annealing in the temperature range from 600 to 900 K. At the same time, the Au(111) surface assumes a serrated, <110> oriented step-edge morphology, suggesting step-edge pinning by titanium oxide nanoparticles. The oxidation state of these titanium oxide nanoparticles varies with annealing temperature. Specifically, annealing to 900 K results in the formation of stoichiometric TiO{sub 2} nanocrystals as judged by the observed XPS binding energies. Nano-dispersed TiO{sub 2} on Au(111) is an ideal system to test the various models explaining the enhanced catalytic reactivity of supported Au nanoparticles
Comparison of the liquid and gas phase photocatalytic activity of flame-synthesized TiO2 catalysts: the role of surface quality
Adsorbate-induced lifting of substrate relaxation is a general mechanism governing titania surface chemistry
Anatomy of the Photochemical Reaction: Excited-State Dynamics Reveals the C–H Acidity Mechanism of Methoxy Photo-oxidation on Titania
Direct in situ determination of the polarization dependence of physisorption on ferroelectric surfaces
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