Nanocrystalline Zinc Oxide

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Nanocrystalline Zinc Oxide

• N. Tabet, M. Faiz and A.L. Al-Oteibi
• Physics Department, KFUPM, Dhahran, Saudi Arabia
• natabet_at_kfupm.edu.sa

3rd Sesame Users Meeting, 11-13 October, 2004,
Antalya, Turkey
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Collaboration

• N. Boulares, K. Guergouri and R. Zouaghi, Univ.
  Constantine, Algeria
• C. Monty, and F. Sibieude, IMP, CNRS-Odeillo,
  France.

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Outline

• Why ZnO ?
• Proprieties and Applications
• 2. ZnO Nanophases Synthesis and XPS
  characterization
• -Nanopowders
• - Nanofibers
• - Films

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ZnO Nanolaser
Peidong Yang, Eicke Weber, Richard Russo Science
2001
N. Tabet, 2004, submitted
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ZnO Applications Gas Sensors
Metal contact
Metal contact
ZnO film
Mechanism Charged Oxygen vacancies carrier
density function of PO2
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Photocatalytic Degradation of Molinuron
Xenon lamp
250 ml Monolinuron (4mg/l) ZnO nanpowder
ZnO Nanopowder
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Nanocrystalline ZnO

• ZnO pure and Doped Nanopowders
• Synthesis
• Vapor-condensation in a Solar furnace

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1000kW Solar Furnace, Odeillo, France
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2 kW solar furnace
Parabolic mirror and a solar reactor
Plane mirror Tracking the sun
Solar reactor
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ZnO under focused Sun Light
Movie 2
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In2O3-Doped ZnO nanopowders
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In2O3-Doped nanopowders
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ZnO nanopowders- Ar Sputtering
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ZnO Thin Films
DC-Magnetron Reactive Plasma
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As grown ZnO Thin Films
ATF11-Po25x10-4 mbar
ATF13-Po210-3 mbar
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N-Implanted ZnO Thin Films
T 250C, 60min.
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N-Implanted Zn single crystals
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ZnO Nanofibers
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ZnO Nanofibers
N. Tabet et al., 2004
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ZnO Nanocrystals
N. Tabet at al., submitted
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Conclusion

• High Resolution XPS (synchrotron) needed to
  understand the behaviour of nitrogen

Thank You
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Zn Oxidation
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N-implanted Zn single crystal
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Zn- Oxidation
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Photoluminescence
Detector
Ar-Laser, 335.8nm
Sample
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Photoluminescence (2)
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Photocatalytic Degradation of Molinuron
UV light

• OH- h ? OH
• 
  
  
• O2 (ads) e- ? O2-

OH-
Oabs
ZnO

-
O2
C9H11N2O2Cl 13O2 ? 9CO2 4H2O 2NO3- Cl-
3H
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Exponential reduction of the grain size
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As grown ZnO Thin Films
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N-Implanted ZnO Thin Films
T 250C, 60min.
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N-Implanted ZnO Thin Films
T 250C, 60min.
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XRD and Grain Size
nanopowder
micropowder
D l/bcosq
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Photocatalytic Degradation of Molinuron
In-doped ZnO Nanopowder
ZnO micro
ZnO Nanopowder