Synthesis of doped ZnO nanopowders in microwave hydrothermal reactors

Agnieszka Opalińska 1,2,  Witold Łojkowski 1,  Tadeusz Chudoba 1,  Ewa Grzanka 1,  Tomasz Strachowski 1,2,  Aharon Gedanken 3,  Robert R. Piticescu 4,  Marek Godlewski 5,6,  Sergiy A. Yatsunenko 5,  Edward Reszke 7,8

1. Polish Academy of Sciences, Institute of High Pressure Physics (UNIPRESS), Sokolowska 29/37, Warszawa 01-142, Poland
2. Warsaw University of Technology, Faculty of Materials Science and Engineering (InMat), Wołoska 141, Warszawa 02-507, Poland
3. Bar-Ilan University, Ramat-Gan 52900, Israel
4. Institute for Non-ferrous and Rare Metals, 102 Biruintei Blvd., Pantelimon 73957, Romania
5. Polish Academy of Sciences, Institute of Physics, al. Lotników 32/46, Warszawa 02-668, Poland
6. Cardinal Stefan Wyszynski University, College of Science, Warszawa, Poland
7. Plazmatronika SA, Osobowiecka 70, Wrocław 51-008, Poland
8. Ertec Poland Edward Reszke (Ertec), Rogowska, Wrocław 54-440, Poland

Abstract

ZnO nanopowders and ZnO doped with Mn2+, Co2+, Ni2+, Cr3+ and Al3+  ions have been produced in hydro and solvothermal reactions. The reactors were lined with Teflon, to ensure high purity of the powders, and preventing corrosion products to be mixed with the powders.

The main result of the studies of synthesis process was that during solvo or hydrothermal synthesis high level of doping is possible, comparing to high temperature processes.

In the case of ZnO:Mn it was shown that even for 8 mol % doping the material is paramagnetic. Therefore It seems that this is not a prospective spintronics materials.

In the case of Al doped nanopowders it was found that addition of aluminum strongly increases luminescence of the powders.

Use of microwaves for heating of the reagents we could considerably (about 5 times) shorten the reaction time. This is so because thermal inertia of the pressure vessel was not a time limiting factor: energy was delivered directly to the reagents.

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Presentation: Poster at COST D30 Final Evaluation Meeting, by Agnieszka Opalińska
See On-line Journal of COST D30 Final Evaluation Meeting

Submitted: 2007-10-18 10:47
Revised:   2007-10-18 10:47
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