ZnO Oxygen Vacancies Formation and Filling ...
Document type :
Article dans une revue scientifique
DOI :
Permalink :
Title :
ZnO Oxygen Vacancies Formation and Filling Followed by in Situ Photoluminescence and in Situ EPR
Author(s) :
Drouilly, Charlotte [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Krafft, Jean-Marc [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Averseng, Frédéric [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Casale, Sandra [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Bazer-Bachi, Delphine [Auteur]
IFP Energies nouvelles [IFPEN]
Chizallet, Céline [Auteur]
IFP Energies nouvelles [IFPEN]
Lecocq, Vincent [Auteur]
IFP Energies nouvelles [IFPEN]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Lauron-Pernot, Hélène [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Costentin, Guylène [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Laboratoire de Réactivité de Surface [LRS]
Krafft, Jean-Marc [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Averseng, Frédéric [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Casale, Sandra [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Bazer-Bachi, Delphine [Auteur]
IFP Energies nouvelles [IFPEN]
Chizallet, Céline [Auteur]
IFP Energies nouvelles [IFPEN]
Lecocq, Vincent [Auteur]
IFP Energies nouvelles [IFPEN]
Vezin, Herve [Auteur]
Laboratoire Avancé de Spectroscopie pour les Intéractions la Réactivité et l'Environnement (LASIRE) - UMR 8516
Lauron-Pernot, Hélène [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Costentin, Guylène [Auteur]
Laboratoire de Réactivité de Surface [LRS]
Journal title :
The Journal of Physical Chemistry C
Abbreviated title :
J. Phys. Chem. C
Volume number :
116
Pages :
21297-21307
Publisher :
American Chemical Society (ACS)
Publication date :
2012-10-11
ISSN :
1932-7447
English keyword(s) :
Oxides
Oxygen
Electron paramagnetic resonance spectroscopy
Photoluminescence
Defects in solids
Oxygen
Electron paramagnetic resonance spectroscopy
Photoluminescence
Defects in solids
HAL domain(s) :
Chimie/Chimie théorique et/ou physique
English abstract : [en]
Oxygen vacancies of zinc oxide were followed by photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies. The green PL emission was associated with oxygen vacancies: its intensity is enhanced upon ...
Show more >Oxygen vacancies of zinc oxide were followed by photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies. The green PL emission was associated with oxygen vacancies: its intensity is enhanced upon static thermal treatment under inert or under vacuum, whereas it decreases upon oxygen treatment. A unique EPR signal at g = 1.96 was measured at room temperature after thermal in situ treatment under flow of inert or oxygenated atmospheres, its double integration follows the same trends than the green PL emission and its evolution was shown to probe the oxygen vacancy concentrations. The relative concentration of the related paramagnetic species would be increased/decreased upon trapping/release of the electron associated to the formation/filling of oxygen vacancy. The influence of Ti impurities on the PL and RPE signals was investigated. Finally, it is concluded that the EPR signal is related to oxygen vacancies and its position shift could be explained by the involvement of some mixing orbitals. Thanks to static (PL and EPR) and dynamic (EPR) in situ characterizations, the conditions of formation or filling of oxygen vacancies are discussed depending of the atmosphere and temperature of the pretreatment of kadox and ex-carbonate zinc oxide. High temperature treatments, inert atmospheres, and vacuum lead to the formation of new oxygen vacancies. This process is reversible upon oxygenated atmospheres. The efficiency of such filling up depends on the temperature and starts to prevail on the oxygen vacancy formation below 500 K. It is also shown that few native oxygen vacancies can also be filled up.Show less >
Show more >Oxygen vacancies of zinc oxide were followed by photoluminescence (PL) and electron paramagnetic resonance (EPR) spectroscopies. The green PL emission was associated with oxygen vacancies: its intensity is enhanced upon static thermal treatment under inert or under vacuum, whereas it decreases upon oxygen treatment. A unique EPR signal at g = 1.96 was measured at room temperature after thermal in situ treatment under flow of inert or oxygenated atmospheres, its double integration follows the same trends than the green PL emission and its evolution was shown to probe the oxygen vacancy concentrations. The relative concentration of the related paramagnetic species would be increased/decreased upon trapping/release of the electron associated to the formation/filling of oxygen vacancy. The influence of Ti impurities on the PL and RPE signals was investigated. Finally, it is concluded that the EPR signal is related to oxygen vacancies and its position shift could be explained by the involvement of some mixing orbitals. Thanks to static (PL and EPR) and dynamic (EPR) in situ characterizations, the conditions of formation or filling of oxygen vacancies are discussed depending of the atmosphere and temperature of the pretreatment of kadox and ex-carbonate zinc oxide. High temperature treatments, inert atmospheres, and vacuum lead to the formation of new oxygen vacancies. This process is reversible upon oxygenated atmospheres. The efficiency of such filling up depends on the temperature and starts to prevail on the oxygen vacancy formation below 500 K. It is also shown that few native oxygen vacancies can also be filled up.Show less >
Language :
Anglais
Peer reviewed article :
Oui
Audience :
Internationale
Popular science :
Non
Administrative institution(s) :
Université de Lille
CNRS
CNRS
Collections :
Research team(s) :
Propriétés magnéto structurales des matériaux (PMSM)
Submission date :
2021-06-17T15:35:55Z
2021-10-07T13:43:00Z
2021-10-07T13:43:00Z