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Träfflista för sökning "WFRF:(Farstad M. H.) srt2:(2013)"

Sökning: WFRF:(Farstad M. H.) > (2013)

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1.
  • Schaefer, A., et al. (författare)
  • Controlled modification of nanoporous gold : Chemical vapor deposition of TiO2 in ultrahigh vacuum
  • 2013
  • Ingår i: Applied Surface Science. - : Elsevier BV. - 0169-4332 .- 1873-5584. ; 282, s. 439-443
  • Tidskriftsartikel (refereegranskat)abstract
    • TiO2 has been deposited in the first 400 nm of a nanoporous gold (NPG) structure using metal organic chemical vapor deposition with titanium-tetraisopropoxide as single source precursor in ultra high vacuum. The NPG has been pretreated by ozone to clean and stabilize the structure for deposition. The deposited oxide stabilizes the porous structure, otherwise prone to coarsening at elevated temperatures, up to 300 degrees C. The study combines the controlled sample preparation with a functional test of the prepared catalyst under real conditions in a continuous gas flow reactor. The catalytic activity of the loaded NPG at 60 degrees C for CO oxidation is found to be superior to unloaded as-prepared NPG.
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2.
  • Ragazzon, Davide, et al. (författare)
  • Chemical vapor deposition of ordered TiOx nanostructures on Au(111)
  • 2013
  • Ingår i: Surface Science. - : Elsevier BV. - 0039-6028 .- 1879-2758. ; 617, s. 211-217
  • Tidskriftsartikel (refereegranskat)abstract
    • The deposition of TiOx (x <= 2) structures on Au(111) by chemical vapor deposition (CVD) in ultrahigh vacuum (UHV) has been investigated with high-resolution core level photoelectron spectroscopy (PES), low-energy electron diffraction (LEED) and scanning tunneling microscopy (STM). Using titanium tetra-isopropoxide as single source precursor it is possible to form different TiOx phases on the surface after deposition: at low coverages, we observe large two-dimensional (2D) honeycomb-lattice Ti2O3 islands with a (2 x 2) registry with the substrate. Higher coverages are dominated by the formation of three-dimensional (3D) TiO2 structures. The TiO2 structures are atomically well ordered provided that the deposition temperature is high enough (500 degrees C). The ordered structure exhibits a LEED pattern characteristic for a rectangular surface unit cell. By performing the deposition at different temperatures it is possible to tune the balance between the 2D and 3D phases: Growth at 500 degrees C significantly favors the formation of 3D TiO2 islands as compared to growth at 200 degrees C and 300 degrees C. (C) 2013 Elsevier B.V. All rights reserved.
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refereegranskat (2)
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Borg, A (2)
Sandell, Anders (2)
Walle, L. E. (2)
Ragazzon, Davide (2)
Schaefer, A. (2)
Farstad, M. H. (2)
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Uvdal, Per (1)
Wichmann, A (1)
Palmgren, P. (1)
Baeumer, M. (1)
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