Advanced nanoporous yttria-stabilized zirconia ceramics for luminescent oxygen sensors

Janusz D. Fidelus 1,  Łukasz Zych 3,  Donats Millers 2,  Krisjanis Smits 2,  Larisa Grigorjeva 2,  Witold Łojkowski 1,  Krzysztof Haberko 3

1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Institute of Solid State Physics, University of Latvia, 8 Kengaraga, Riga LV-1063, Latvia
3. AGH University of Science and Technology (AGH), al. Mickiewicza 30, Kraków 30-059, Poland

Abstract

The discovered luminescence sensitivity for oxygen content in ZrO2 and  ZrO2:Y nanopowders [1, 2] have recently become of great scientific and technological interest. There is possibility to use these materials in luminescence sensors. However the use of nanopowder for oxygen content detection meet technical difficulties. Therefore important is production of compact ZrO2 material having luminescent properties similar to that known for nanopowders.

In the present work we discuss the results of physicochemical and luminescence investigations of yttria-stabilized zirconia nanopowders obtained by hydrothermal reaction, driven by microwave and nanoporous ceramics prepared from them.

The ceramics with Y2O3 contents of 3 and 8 mol % have been produced from a set of nanopowders and had open porosity within the range of 5 to 50 %. It is shown that the porosity of ceramics depend on technological process during filter-pressing followed by sintering. The porosity of ceramics provide well–developed surface thus the efficiency of processes at the surface (e.g. interaction with oxygen) could be high.

We followed luminescence properties for a number of sintered ceramics, annealed in the oxygen – nitrogen gas mixtures, with  different partial pressures of oxygen. The luminescence of ceramics was compared with that of nanopowders used for ceramics sintering and annealed under the same conditions as ceramics. The differences in the luminescence spectra of those materials have been explained  in connection to the number of defect types.

The work was supported by grant no. N N508 0851 33 of MNiSW granted for the years 2007 – 2009.

References

1. J. D. Fidelus, W. Lojkowski, D. Millers, K. Smits, L. Grigorjeva, R. R. Piticescu: “Zirconia-based nanomaterials for oxygen sensor - generation, characterisation and optical properties” , Solid State Phenomena Vol. 128 (2007) pp. 141-150, online at http://www.scientific.net

2. K. Smits, L. Grigorjeva, W. Łojkowski, J. D. Fidelus: „Luminescence of oxygen related defects in zirconia nanocrystals”, Physica Status Solidi (c) vol. 4 (2007), No. 3, pp. 770–773/DOI 10.1002/pssc.200673850.

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

Submitted: 2008-05-27 11:41
Revised:   2008-06-02 17:27
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