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Defect stabilization in ZnO nanorods by Mg2+ doping.

Onattu D Jayakumar1, Vasanthakumaran Sudarsan, K Shashikala

  • 1Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400085, India.

Journal of Nanoscience and Nanotechnology
|July 23, 2011
PubMed
Summary

Hydrogenation transforms zinc oxide (ZnO) and magnesium-doped zinc oxide (Zn0.95Mg0.05O) nanorods into particles. This process enhances green luminescence in Zn0.95Mg0.05O by stabilizing zinc vacancies, while suppressing it in ZnO.

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Published on: April 12, 2019

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Chemistry

Background:

  • Zinc oxide (ZnO) nanostructures exhibit unique optical properties influenced by defects.
  • Magnesium doping in ZnO can modify its structural and luminescence characteristics.
  • Hydrogenation is a process that can alter the defect landscape and properties of metal oxides.

Purpose of the Study:

  • To investigate the structural and luminescence changes in ZnO and Zn0.95Mg0.05O nanorods upon hydrogenation.
  • To understand the role of magnesium doping in stabilizing defects during hydrogenation.
  • To correlate morphological and defect evolution with luminescence behavior.

Main Methods:

  • Solvothermal synthesis of ZnO and Zn0.95Mg0.05O nanorods.
  • Hydrogenation treatment at room temperature.
  • Morphological characterization using electron microscopy.
  • Photoluminescence spectroscopy to analyze emission properties.

Main Results:

  • Hydrogenation induced a morphological transformation from nanorods to nanoparticles (<100 nm) in both ZnO and Zn0.95Mg0.05O.
  • Defect-related green emission was enhanced in hydrided Zn0.95Mg0.05O but suppressed in hydrided ZnO.
  • Luminescence studies indicated stabilization of zinc vacancies in Zn0.95Mg0.05O after hydrogenation, despite their presence in the as-prepared samples.

Conclusions:

  • Hydrogenation significantly alters the morphology and luminescence of ZnO and Zn0.95Mg0.05O nanorods.
  • Magnesium doping in ZnO plays a crucial role in stabilizing zinc vacancies under hydrogenation, leading to enhanced green emission.
  • The findings provide insights into defect engineering in doped metal oxide nanostructures for tailored optoelectronic applications.