Effects of Transition Metal Doping on the Growth and Properties of Rutile TiO2 Nanoparticles

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• 作者：G. Cristian V谩squez ; M. Andrea Peche-Herrero ; David Maestre ; Ana Cremades ; Julio Ram铆rez-Castellanos ; Jos茅 Mar铆a Gonz谩lez-Calbet ; Javier Piqueras
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：January 31, 2013
• 年：2013
• 卷：117
• 期：4
• 页码：1941-1947
• 全文大小：415K
• 年卷期：v.117,no.4(January 31, 2013)
• ISSN：1932-7455

文摘

Rutile TiO₂ 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 TiO₂ rutile phase has been stabilized in the doped nanoparticles at 650 掳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 Ti³⁺ 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 TiO₂ 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 Ti³⁺ in the near-surface region of the nanoparticles, the concentration of which decreases when doping. The presence of Ti³⁺ interstitials related states in the band gap is discussed.