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Träfflista för sökning "WFRF:(Azevedo S) srt2:(2005-2009)"

Sökning: WFRF:(Azevedo S) > (2005-2009)

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1.
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2.
  • da Silva, A. F., et al. (författare)
  • Optical properties of in situ doped and undoped titania nanocatalysts and doped titania sol-gel nanofilms
  • 2006
  • Ingår i: Applied Surface Science. - : Elsevier BV. - 0169-4332 .- 1873-5584. ; 252:15, s. 5365-5367
  • Tidskriftsartikel (refereegranskat)abstract
    • In this paper we present spectroscopic properties of doped and undoped titanium dioxide (TiO2) as nanofilms prepared by the sol-gel process with rhodamine 6G doping and studied by photoacoustic absorption, excitation and emission spectroscopy. The absorption spectra of TiO2 thin films doped with rhodamine 6G at very low concentration during their preparation show two absorption bands, one at 2.3 eV attributed to molecular dimmer formation, which is responsible for the fluorescence quenching of the sample and the other at 3.0 eV attributed to TiO2 absorption, which subsequently yields a strong en-fission band at 600 nm. The electronic band structure and optical properties of the rutile phase of TiO2 are calculated employing a fully relativistic, full-potential, linearized, augmented plane-wave (FPLAPW) method within the local density approximation (LDA). Comparison of this calculation with experimental data for TiO2 films prepared for undoped sol-gels and by sputtering is performed.
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3.
  • Tomas, S. A., et al. (författare)
  • Optical and electronic characterization of the band structure of blue methylene and rhodamine 6G-doped TiO2 sol-gel nanofilms
  • 2005
  • Ingår i: Microelectronics Journal. - : Elsevier BV. - 0026-2692. ; 36:3-6, s. 570-573
  • Tidskriftsartikel (refereegranskat)abstract
    • The optical properties and the band structure of TiO2 sol-gel thin films prepared by the sot-gel process and doped with methylene blue or rhodamine were studied by absorption, excitation and emission spectroscopy. The absorption spectra show two absorption bands, around 2.3 eV and above 3.0 eV suggesting that besides the excitation bands observed in rhodamine at 2.3 eV an efficient energy transfer occurs between the TiO2 conduction band and the molecular rhodamine excited states, yielding a strong emission band at 600 nm, while for methylene blue a strong hypsochromic shift of the absorption bands is observed. The optical absorption and band gap energy for the phase rutile of TiO2 films were calculated with a LDA+U/FPLAPW method, and a comparison of this calculation with experimental data of TiO2 films prepared by undoped sol-gel and sputtering is performed.
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