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Balti, I., Mezni, A., Dakhlaoui-Omrani, A., Leone, P., Viana, B., Brinza, O., Smiri, L.-S. & Jouini, N. (2011) Comparative Study of Ni- and Co-Substituted ZnO Nanoparticles: Synthesis, Optical, and Magnetic Properties. J. Phys. Chem. C, 115 15758–15766. 
Added by: Laurent Cournède (2016-03-10 21:32:20)
Type de référence: Article
DOI: 10.1021/jp201916z
Numéro d'identification (ISBN etc.): 1932-7447
Clé BibTeX: Balti2011
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Catégories: ST2E
Mots-clés: doped zno, hydroxide, metal, morphological-characteristics, Nickel, polyol medium, room-temperature ferromagnetism, semiconductors, thin-films, zinc-oxide
Créateurs: Balti, Brinza, Dakhlaoui-Omrani, Jouini, Leone, Mezni, Smiri, Viana
Collection: J. Phys. Chem. C
Consultations : 3/391
Indice de consultation : 1%
Indice de popularité : 0.25%
Résumé     
Ni- and Co-substituted ZnO nanoparticles were synthesized using forced hydrolysis of acetate metallic salts in a polyol medium. The X-ray diffraction patterns show a hexagonal wurtzite structure (space group P6(3)mc). The characteristic absorption bands of UV-vis-IR spectra are correlated with the d-d transitions of tetrahedrally coordinated Co2+ and Ni2+ ions in octahedral and tetrahedral sites. The photoluminescence spectra exhibited a typical ZnO UV-exitonic emission band around 380 nm and a broad band between 400 and 500 nm that might be ascribed to the intrinsic defects in the ZnO material. The transmission electron microscopy displays spherical particles with a diameter between 20 and 30 nm. The magnetic measurements reveal that Zn1-xNixO and Zn1-xCoxO nanoparticles show, respectively, ferromagnetic and paramagnetic behavior at 5 K. Homogeneous distributions of Co and Ni ions in the particles observed by filter imaging analysis indicates that there is no evidence of Co or Ni metal throughout the powders.
Added by: Laurent Cournède  
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