Nanostructural characterization and magnetic properties of pure and Fe, Co or Mn-doped TiO2 nanopowders prepared by Solar Physical Vapor Deposition (SPVD)

Jules KOUAM 2Janusz D. Fidelus 1Larisa Grigorjeva 3Alexei Kuzmin 3Felipe SANDIUMENGE 4Lluis BALCELLS 4Marisol S. Martín-Gonzalez 5Claude J. Monty 2

1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. CNRS laboratoire Procedes, Materiaux et Energie solaire (PROMES), BP5 Odeillo, Font-Romeu 66120, France
3. Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga LV-1063, Latvia
4. Institut de Ciencia de Materials (ICMAB) - CSIC (ICMAB), Campus de la UAB, Barcelona 080193, Spain
5. Instituto de Microelectronica de Madrid (CNM-CSIC), Madrid, Spain

Abstract

It is well known that the incorporation of metal ions in TiO2 powder may substantially change their bulk and surface properties such as magnetic properties or photocatalytic activity. The main parameters include the character and concentration of the dopant and the thermal treatments.

In this work we present results of the synthesis of transition metal (TM-) doped TiO2 powders using the Solar Physical Vapor Deposition process (SPVD) in a 2kW solar reactor as well as the characterization using XRD, SEM, TEM and HRTEM, XPS and Raman spectroscopy.

Depending on the air pressure in the solar reactor during the vaporization-condensation process, Anatase or Rutile phase, or a mixture of both, was obtained. Average grain sizes were measured from XRD peaks width. For pure TiO2 they vary in between 15 and 30 nm.

The Rutile phase is the major phase but the Anatase phase has an important contribution. We have found in Ti1-xFexO2 targets, that the grain size of the nanopowders depends on the phase studied : the Rutile grain size increases with the metal content increasing (x=0.01 and x=0.02).

Magnetic measurements, performed by SQUID magnetometer, make evident the paramagnetic character of Fe, Co and Mn doped TiO2 nanopowders.

Acknowledgements

We are indebted to the EC program SOLFACE (6th PCRDT) and to the French ECO-NET program (EGIDE) for supporting a part of this work.

 

Related papers
  1. Comparison of RE ion luminescence in zirconia nanocrystals and Single crystals
  2. Influence of heat treatment on luminescence of ZrO+ Eu nanopowders
  3. Optyczny sensor tlenu na bazie nanokrystalicznego ZrO2
  4. High-pressure diffraction study of structural and elastic properties of zircon-type and scheelite-type RVO4 (R = Nd, Eu)
  5. Advanced nanoporous yttria-stabilized zirconia ceramics for luminescent oxygen sensors
  6. Novel synthesis methods of Co-doped ZnO Nanopowders
  7. Excitation transfer in zirconia nanocrystals and ceramics
  8. Eu Luminescence in zirconia nanocrystals
  9. ZnO ceramic sintering and luminescence properties
  10. Effect of annealing on the structure and microstructure of Pr doped ZrO2-Y2O3 nanocrystals
  11. Synthesis of Al doped ZnO nanopowders and their enhanced luminescence
  12. Luminescence properties of zinc oxide nanopowders doped with Al ions obtained by the hydrothermal and vapour condensation methods.
  13. Microstructural analysis of ZnO powders with different concentrations of Al dopant obtained by means of hydrothermal synthesis
  14. Fast luminescence in ZnO structures
  15. Luminescence properties of cerium doped Y3Al5O12 nanopowders and nanoceramic
  16. Mapping dopants effects in the High pressure synthesis of nanostructured zinc oxide
  17. Spectroscopic studies of magnon excitations in nanosized NiO
  18. Advanced nanostructural zirconia ceramics for optical oxygen sensors
  19. Study of undoped and doped zirconia nanocrystals luminescence
  20. Zirconia-based nanomaterials for oxygen sensor - generation, characterisation and optical properties
  21. Particle Size Distribution of ZrO2:Pr3+- Influences of pH, High Power Ultrasound, Surfactant and Dopant Quantity
  22. Time-Resolved Luminescence Characteristics of Doped YAG and YAP Nanopowders
  23. The luminescence properties of ZnO:Al nanopowders obtained by sol-gel and vaporization-condensation methods
  24. Cathodoluminescence of Al doped ZnO nanopowders
  25. Morphology of Al doped Zinc Oxide Obtained using Hydrothermal and Vapour Condensation Methods
  26. Luminescence of Europium doped ZrO2 nanopowder
  27. Synthesis and XRD/PL studies of pure and Sb2O3 doped ZnO nanophases
  28. Morphology of Al doped zinc oxide obtained by the vapour condensation method
  29. Morphology of Al-Doped Zinc Oxide Obtained by the Vapour Condensation Methods
  30. Preliminary research on zirconia based optical oxygen sensor
  31. Preparation and characterisation by XRD and TEM of ZnO based magnetic helionanos
  32. New routes for the synthesis of Al-doped ZnO transparent nanomaterials
  33. Time-resolved luminescence of nanostructured ZnO
  34. Yttria stabilized zirconia nanocrystals luminescence
  35. Synthesis of Al-doped ZnO nanomaterials with controlled luminescence properties
  36. Nanophase Production Using Solar Energy
  37. Influence of synthesis conditions on the particles size and the morphology of zinc oxide nanopowders
  38. Ionic Conductivity of 4%mol, 9.5%mol Yttria doped Zirconia Nanomaterials and (YSZ )0.98-(Al2O3)0.02 Nanocomposites
  39. Luminescence of ZrO2 nanocrystals
  40. Molecular impurities in the luminescent ZnO nanocrystals
  41. HYDROTHERMAL SYNTHESIS OF NANOSTRUCTURED ZIRCONIA MATERIALS: PRESENT STATE AND FUTURE PROSPECTS
  42. Luminescence of ZrO2 and ZnO nanocrystals
  43. Luminescence mechanisms: from single crystals to nanocrystals
  44. Color centers in YAP:Pr crystals
  45. Luminescense of Nanosize ZrO2

Presentation: Poster at E-MRS Fall Meeting 2008, Symposium D, by Janusz D. Fidelus
See On-line Journal of E-MRS Fall Meeting 2008

Submitted: 2008-05-28 13:09
Revised:   2009-06-07 00:48