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12 results on '"Galinetto, P."'

9. Photoinduced charge transport in KTaO3:Be

Author

Galinetto, P., primary, Rossella, F., additional, Giulotto, E., additional, Samoggia, G., additional, Trepakov, V., additional, Jastrabik, L., additional, Syrnkov, P., additional, and Kapphan, S., additional

Published
2005
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11. One-Step Decatungstate-Photomediated PEGylation of Single-Walled Carbon Nanotubes

Author

Sara Montanaro, Eliana Quartarone, Pietro Galinetto, Davide Ravelli, Piercarlo Mustarelli, Maurizio Fagnoni, Corrado Tomasi, Daniele Merli, Ravelli, D, Montanaro, S, Tomasi, C, Galinetto, P, Quartarone, E, Merli, D, Mustarelli, P, and Fagnoni, M

Subjects
Nanotube, Nanotubes, Photochemistry, PEGylation, technology, industry, and agriculture, Radicals, macromolecular substances, General Chemistry, Polyethylene glycol, Carbon nanotube, Hydrogen atom abstraction, law.invention, photocatalysi, chemistry.chemical_compound, chemistry, law, Raman spectroscopy, Photocatalysis, Surface modification, carbon nanotube, Decatungstate salt, Dissolution
Abstract

A straightforward PEGylation of SWCNTs has been performed by photomediated addition of various PEG derivatives onto the nanotube surfaces. The reaction was promoted both by UV and by solar light and took place under very mild conditions using commercial PEGs as PEGylating agents. The process relies on the formation of a-oxy radicals directly from PEGs by a photochemical hydrogen abstraction reaction mediated by a decatungstate salt. Actually, low-molecular-weight PEGs (e.g. PEG 200) added more efficiently than those having long polyethylene glycol chains (e.g. PEG 600). Interestingly, the functionalization caused a partial dissolution of the resulting CNTs in the reaction medium. © 2012 Wiley-VCH Verlag GmbH & Co. KGaA, Weinheim.

Published
2012

12. Photoinduced charge transport in KTaO 3 :Be

Author

Giorgio Samoggia, L. Jastrabik, S. E. Kapphan, E. Giulotto, Francesco Rossella, Pietro Galinetto, P. Syrnkov, V. A. Trepakov, Galinetto, P., Rossella, Francesco, Giulotto, E., Samoggia, G., Trepakov, V., Jastrabik, L., Syrnkov, P., and Kapphan, S.

Subjects
Phase instability, Photon, Ionic radius, Condensed matter physics, Chemistry, Photoconductivity, Doping, Charge (physics), Irradiation, Ion
Abstract

We present the first growth of KTaO3:Be (6% at. in the batch) single crystals, together with photoconductivity and thermally stimulated currents studies of this material. It is probably that very small Be2+ ions (ionic radius ∼0.35 A ) mostly substitute K+(1.64 A) and bounded and/or free electronic states formation including polaronic states. As a results Be-doping effect can strongly influence phase instability and electronic properties of KTaO3. It was found that Be2+ doping leads to appreciable photocurrents already at room temperature under irradiation of the samples with photons even at energies just below the fundamental optical gap. Photoconductivity increases strongly at low temperature. Intense thermally stimulated current peaks between 15 and 100 K are probably due to the presence of shallow hole traps and polaronic centres. The obtained results are compared to past observations in pure KTaO3 and KTaO3:Li (© 2005 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Published
2005

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