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Title: Nucleation and growth of Pt nanoparticles on reduced and oxidized rutile TiO{sub 2} (110)

The nucleation and growth of Pt nanoparticles (NP’s) on rutile TiO{sub 2} (110) surfaces with O on-top atoms (oxidized TiO{sub 2}), surface O vacancies, and H adatoms, respectively (reduced TiO{sub 2}), was studied by means of scanning tunneling microscopy (STM) experiments and density functional theory calculations. At room temperature, Pt was found to be trapped at O on-top atoms and surface O vacancies, leading to rather small Pt NP’s. In contrast, on surfaces with H adatoms the mobility of Pt was much larger. As a result, large Pt NP's were found at room temperature on TiO{sub 2} (110) surfaces with H adatoms. However, at ∼150 K the diffusion of Pt was kinetically hindered on all TiO{sub 2} (110) surfaces considered. STM data acquired after vacuum-annealing at 800 K showed comparable results on all TiO{sub 2} (110) surfaces because the diffusion of Pt is not influenced by surface defects at such high temperatures.
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Interdisciplinary Nanoscience Center (iNANO), Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C (Denmark)
  2. Haldor Topsøe A/S, Nymøllevej 55, DK-2800 Kgs. Lyngby (Denmark)
Publication Date:
OSTI Identifier:
22413276
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 141; Journal Issue: 21; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANNEALING; DEFECTS; DENSITY FUNCTIONAL METHOD; DIFFUSION; NANOPARTICLES; NUCLEATION; RUTILE; SCANNING TUNNELING MICROSCOPY; SURFACES; TEMPERATURE RANGE 0273-0400 K; TITANIUM OXIDES