PL EN


Preferences help
enabled [disable] Abstract
Number of results
2009 | 116 | 4 | 603-606
Article title

Optical Characterization of Laser-Synthesized Anatase TiO_{2} Nanopowders by Spectroscopic Ellipsometry and Photoluminescence Measurements

Content
Title variants
Languages of publication
EN
Abstracts
EN
Nanosized titania (TiO_{2}) is synthesized by laser-induced pyrolysis using TiCl_{4} as a liquid precursor. X-ray diffraction and Raman scattering confirmed anatase structure of TiO_{2} nanocrystals. The dielectric function ε(ω) of TiO_{2} nanopowders has been determined by spectroscopic ellipsometry in the energy range from 1.5 to 6 eV at room temperature. The features observed in ε(ω) have been fitted to analytical line shapes by using the second derivatives of experimental spectra. The energies corresponding to different interband electronic transitions have been determined. Photoluminescence measurements have been carried out in vacuum for T = 20 K and T = 300 K. Under laser irradiation with sub-band gap photon energy, anatase nanocrystals have displayed strong visible photoluminescence emission. In this broad photoluminescence band different variations of line shape and position with excitation energy and temperature are observed for nanopowders with different crystallite size, pointing out to the various electronic transitions mediated by defect levels within the band gap.
Keywords
Contributors
  • Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia
  • Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia
author
  • Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia
  • Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia
author
  • Center for Solid State Physics and New Materials, Institute of Physics, Belgrade, Serbia
References
  • 1. W.F. Zhang, M.S. Zhang, Z. Yin, Q. Chen, Appl. Phys. B 70, 261 (2000)
  • 2. P. Lautenschlager, S. Logothetidis, L. Vina, M. Cardona, Phys. Rev. B 32, 3811 (1985)
  • 3. K. Kumazaki, L. Vina, C. Umbach, M. Cardona, Phys. Status Solidi B 156, 371 (1989)
  • 4. B. Karunagaran, R.T. Rajendra Kumar, C. Viswanathan, D. Mangalaraj, Sa.K. Narayandass, G. Mohan Rao, Cryst. Res. Technol. 38, 773 (2003)
  • 5. F. Curcio, M. Musci, N. Notaro, C. Nannetti, Appl. Surf. Sci. 36, 52 (1989)
  • 6. M. Šćepanović, Z.D. Dohčević-Mitrović, I. Hinić, M. Grujić-Brojčin, G. Stanišić, Z.V. Popović, Mater. Sci. Forum 494, 265 (2005)
  • 7. P. Petrik, Phys. Status Solidi A 205, 732 (2008)
  • 8. M. Grujić-Brojčin, M.J. Šćepanović, Z.D. Dohčević-Mitrović, I. Hinić, B. Matović, G. Stanišić, Z.V. Popović, J. Phys. D, Appl. Phys. 38, 1415 (2005)
  • 9. M. Leòn, S. Levcenko, A. Nateprov, A. Nicorici, J.M. Merino, R. Serna, E. Arushanov, J. Phys. D, Appl. Phys. 40, 740 (2007)
  • 10. P. Lautenschlager, M. Garriga, S. Logothetidis, M. Cardona, Phys. Rev. B 35, 9174 (1987)
  • 11. J.G. Albornoz, R. Serna, M. Leon, J. Appl. Phys. 97, 103515 (2005)
  • 12. D. Reyes-Coronado, G. Rodríguez-Gattorno, M.E. Espinosa-Pesqueira, C. Cab, R. de Coss, G. Oskam, Nanotechnology 19, 145605 (2008)
  • 13. P. Moriarty, Rep. Prog. Phys. 64, 297 (2001)
  • 14. K.M. Reddy, S.V. Manorama, A.R. Reddy, Mater. Chem. Phys. 78, 239 (2003)
  • 15. G. Guisbiers, O. Van Overschelde, M. Wautelet, Apll. Phys. Lett. 92, 103121 (2008)
  • 16. C. Ho, M.-C. Tsai, M.-S. Wong, Appl. Phys. Lett. 93, 081904 (2008)
  • 17. M.R. Teresa, M. Viseu, C. Isabel, Vacuum 52, 115 (1999)
  • 18. N. Daude, C. Gout, C. Jouanin, Phys. Rev. B 15, 3229 (1977)
  • 19. R. Asahi, Y. Taga, W. Mannstadt, A.J. Freeman, Phys. Rev. B 61, 7459 (2000)
  • 20. S. Kitazawa, S. Yamamoto, M. Asano, Y. Saitoh, S. Ishiyama, Nucl. Instrum. Methods Phys. Res. B 232, 94 (2005)
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv116n447kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.