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Título:
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Effects of transition metal doping on the growth and properties of Rutile TiO_2 nanoparticles
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Autores:
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Cristian Vasquez, G. ;
Andrea Peche-Herrero, M. ;
Maestre Varea, David ;
Cremades Rodríguez, Ana Isabel ;
Ramirez-Castellanos, Julio ;
María Gonzalez-Calbe, José ;
Piqueras de Noriega, Javier
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Tipo de documento:
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texto impreso
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Editorial:
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Amer Chemical Soc, 2013-01-31
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/restrictedAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Física de materiales
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Tipo = Artículo
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Resumen:
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Rutile TiO_2 nanoparticles doped with V, Cr, or Mn ions have been synthesized via a modified Pechini method using polymeric precursors. The final particle sizes range between 20 and 500 nm depending on the selected dopant. The TiO_2 rutile phase has been stabilized in the doped nanoparticles at 650 degrees C. Microstructural analysis shows a good crystallinity and cationic homogeneity of the doped nanoparticles. The cathodoluminescence study of the doped and undoped nanoparticles shows a luminescence signal related to the structural defects of the samples and the presence of dopants. In particular, an intense 1.52 eV emission associated with Ti^3+ interstitials dominates the luminescence of undoped nanoparticles, which also exhibit less intense emissions extending from 2 to 3.4 eV. The presence of V, Cr, or Mn in the rutile TiO_2 nanoparticles induces variations in the associated cathodoluminescence signal which would be useful in order to achieve a deeper understanding of the doping process and spread future optical applications. X-ray photoelectron spectroscopy (XPS) confirmed the presence of Ti^3+ in the near-surface region of the nanoparticles, the concentration of which decreases when doping. The presence of Ti^3+ interstitials related states in the band gap is discussed.
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En línea:
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https://eprints.ucm.es/id/eprint/23656/1/CremadesAna59.pdf
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