Electronic Structure and Size of TiO2 Nanoparticles of Controlled Size Prepared by Aerosol Methods |
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Authors: | Leonardo Soriano Petri P Ahonen Esko I Kauppinen Jorge Gómez-García Carmen Morant Francisco J Palomares Marta Sánchez-Agudo Patrick R Bressler José M Sanz |
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Institution: | (1) Departamento de Física Aplicada, Instituto de Materiales Nicolás Cabrera, Universidad Autónoma de Madrid, E-28049 Madrid, Spain, ES;(2) VTT Chemical Technology, SF-02044 Espoo, Finland, FI;(3) Instituto de Ciencia de Materiales de Madrid, CSIC, E-28049 Madrid, Spain, ES;(4) BESSY, D-12489 Berlin-Adlershof, Germany, DE |
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Abstract: | Summary. A complete characterization of nanostructures has to deal both with electronic structure and dimensions. Here we present
the characterization of TiO2 nanoparticles of controlled size prepared by aerosol methods. The electronic structure of these nanoparticles was probed
by X-ray absorption spectroscopy (XAS), the particle size by atomic force microscopy (AFM). XAS spectra show that the particles
crystallize in the anatase phase upon heating at 500°C, whereas further annealing at 700°C give crystallites of 70% anatase
and 30% rutile phases. Raising the temperature to 900°C results in a complete transformation of the particles to rutile. AFM
images reveal that the mean size of the anatase particles formed upon heating at 500°C is 30 nm, whereas for the rutile particles
formed upon annealing at 900°C 90 nm were found. The results obtained by these techniques agree with XRD data.
Received October 5, 2001. Accepted (revised) December 6, 2001 |
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Keywords: | , ,Electronic structure, Nanostructures, Spectroscopy, |
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