Influence of Fe and Al doping in the stabilization of the anatase phase in TiO_2 nanoparticles



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Vásquez, G. Cristian and Andrea Peche-Herrero, M. and Maestre Varea, David and Alemán Llorente, Belén and Ramirez-Castellanos, Julio and Cremades Rodríguez, Ana Isabel and Gonzalez-Calbet, José M. and Piqueras de Noriega, Javier (2014) Influence of Fe and Al doping in the stabilization of the anatase phase in TiO_2 nanoparticles. Journal of materials chemistry C, 2 (48). pp. 10377-10385. ISSN 2050-7526

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Anatase TiO_2 nanoparticles doped with Al or Fe have been synthesized via a modified Pechini method which allows to reach high control in size and composition. Microstructural analysis onfirms the good crystallinity of the doped anatase nanoparticles with average sizes around 5 nm and dopant cationic concentrations up to 30 %. Anatase to rutile transition (ART) has been thermally driven and analyzed as a function of the doping. Thermo-diffraction measurements indicate that the phase transition can be either promoted or inhibited by Fe or Al doping, respectively. The influence of Al and Fe doping in the phase transition has been discussed by means of Raman spectroscopy, Photoluminescence and X-ray Photoelectron spectroscopy, with special attention paid to the role played by Ti^(3+) at the surface. Anatase phase has been stabilized up to temperatures above 900 ºC by appropriate Al doping

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© The Royal Society of Chemistry 2012.
This work was supported by MINECO (Projects MAT2011-23068, MAT 2012-31959 and Consolider Ingenio CSD 2009-00013). Authors are grateful to National Centre for Electron Microscopy (CNME) at Universidad Complutense de Madrid.

Uncontrolled Keywords:Rutile; Photoluminescence; Transformation; Spectroscopy; Transition; Electrodes; Dependence; Particles; Oxidation; Dioxide
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:33343
Deposited On:09 Oct 2015 15:48
Last Modified:05 May 2016 17:03

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