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Article Dans Une Revue physica status solidi (RRL) - Rapid Research Letters Année : 2023

Influence of Cobalt Doping on the Photogenerated Holes in ZnO Nanoparticles

Zahraa Jradi
  • Fonction : Auteur
Dara Marin
  • Fonction : Auteur
Andréa Campos
  • Fonction : Auteur
Martin O’byrne
  • Fonction : Auteur
Olivier Margeat
  • Fonction : Auteur
Sylvain Bertaina
  • Fonction : Auteur

Résumé

The efficient cobalt doping of zinc oxide nanoparticles grown by chemical method, with Co 2+ substituting the Zn 2+ cations, is proved by electron spin resonance spectroscopy for cobalt concentration from 0.01% to 1.00%. The gradual killing of the usual core‐defect signal ( g ≈ 1.96) as the Co concentration is increased prevents its ionization by optical excitation from X 0 to X − , thus inhibiting the corresponding hole releasing. Consequently, the methyl radical is no longer generated on the nanoparticles surface by the photo‐Kolbe reaction . It is thus confirmed that the hole involved in the dissociation of surface acetate actually comes from the optically excited core‐defect g = 1.96, and that the number of these defects can be tuned by some very small amount of cobalt impurities.
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Dates et versions

hal-04286965 , version 1 (15-11-2023)

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Citer

Zahraa Jradi, Dara Marin, Andréa Campos, Martin O’byrne, Olivier Margeat, et al.. Influence of Cobalt Doping on the Photogenerated Holes in ZnO Nanoparticles. physica status solidi (RRL) - Rapid Research Letters, 2023, ⟨10.1002/pssr.202300341⟩. ⟨hal-04286965⟩
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