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Yamaki, Tetsuya; Umebayashi, Tsutomu; Sumita, Taishi*; Yamamoto, Shunya; Maekawa, Masaki; Kawasuso, Atsuo; Ito, Hisayoshi
Nuclear Instruments and Methods in Physics Research B, 206(1-4), p.254 - 258, 2003/05
Times Cited Count：136 Percentile：98.9(Instruments & Instrumentation)Single crystalline titanium dioxide (TiO
) rutile were implanted with 200keV F
at a nominal fluence of 1
10
to 110
ions cm
and then thermally annealed in air up to 1200
for 5h. The radiation damage and its recovery during the subsequent annealing were analyzed by Rutherford backscattering spectrometry in channeling geometry and variable-energy positron annihilation spectroscopy. The lattice disorder was completely annealed at 1200 by the diffusion of point defects to the surface acting as a sink. According to the secondary ion mass spectrometry, the F depth profile was shifted to a shallower region along with the damage recovery, finally producing an F-doped layer where the impurity concentration increased steadily towards the surface. The F doping proved to provide a small modification to the conduction-band edge of TiO, as assessed by theoretical band calculations.
Yamaki, Tetsuya; Kato, Sho*; Yamamoto, Shunya; Hakoda, Teruyuki; Kawaguchi, Kazuhiro*; Kobayashi, Tomohiro*; Suzuki, Akihiro*; Terai, Takayuki*
no journal, ,
A glassy carbon (GC) substrate was implanted with 100 keV tungsten (W) and platinum (Pt) ions at different fluences in order to prepare nanoparticles of W-carbides and Pt-metal, respectively, with diameters of 
10 nm. We discuss a detailed study of compound formation and binding interaction resulting from the W or Pt implants in GC for the first time, emphasizing the importance of chemical effects in determining the final properties of the implanted layer. The chemical effects between the implanted species and the GC substrate were investigated mainly by X-ray photoelectron spectroscopy (XPS) while the morphological properties, i.e., the dispersion states of the implants or the size and shape of the precipitated nanoparticles, were observed by transmission electron microscopy (TEM).
