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Excitonic recombination in superstoichiometric nanocrystalline TiO2 grown by cluster precursors at room temperature (Articolo in rivista)

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Excitonic recombination in superstoichiometric nanocrystalline TiO2 grown by cluster precursors at room temperature (Articolo in rivista) (literal)

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Detto F.; Armani N.; Lazzarini L.; Toccoli T.; Verucchi R.; Aversa L.; Nardi M.; Rossi B.; Salviati G.; Iannotta S. (2012)
Excitonic recombination in superstoichiometric nanocrystalline TiO2 grown by cluster precursors at room temperature
in PCCP. Physical chemistry chemical physics (Print); ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE,, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND (Regno Unito)
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Detto F.; Armani N.; Lazzarini L.; Toccoli T.; Verucchi R.; Aversa L.; Nardi M.; Rossi B.; Salviati G.; Iannotta S. (literal)

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Institute for Electronics and Magnetism, National Research Council, Parco Area delle Scienze 37/A, 43124 Parma, Italy; Institute for Electronics and Magnetism, National Research Council, via alla Cascata 56/C, 38123 Povo, Italy; Institut fur Physik, Humboldt-Universitat zu Berlin, Newtonstrasse 15, 12489 Berlin, Germany; Physics Department, University of Trento, via Sommarive 14, 38123 Povo, Italy (literal)

Titolo

Excitonic recombination in superstoichiometric nanocrystalline TiO2 grown by cluster precursors at room temperature (literal)

Abstract

Unprecedented room temperature excitonic emissions are achieved from TiO2 nanocrystals synthesized at 300 K by supersonic cluster beams. Transmission electron microscopy studies show the crystalline nature of the nanoparticles (NPs) with a diameter ranging from 5 to 30 nm. All the samples show mixed rutile and anatase phases as confirmed by Raman spectroscopy. XPS core level analyses evidence an O/Ti ratio of the as-grown nanoparticles of 2.30 +/- 0.04. Two room temperature cathodoluminescence excitonic peaks observed at 3.16 and 3.25 eV are ascribed to the coexistence of rutile and anatase crystallographic phases respectively. Subsequent thermal treatments at 450 degrees C cause the complete quenching of the UV excitonic emissions and result in a more conventional broad visible band centered at 2.5 eV. HRTEM and XPS studies reveal that, after annealing, the NPs remain single crystals in nature with an O/Ti ratio of 2.20 +/- 0.04. These results suggest a correlation between the emission properties and the oxygen concentration of our NPs. The achieved ability to tune the optical properties of TiO2 nanoparticles is very promising for sensing and energy applications. (literal)

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