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  • 1.
    Concina, Isabella
    et al.
    CNR IDASC SENSOR Lab.
    Natile, M. M.
    Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing.
    Ferroni, M.
    CNR IDASC SENSOR Lab.
    Migliori, A.
    CNR-IMM Sezione di Bologna.
    Morandi, V.
    CNR-IMM Sezione di Bologna.
    Ortolani, L.
    CNR-IMM Sezione di Bologna.
    Vomiero, Alberto
    CNR IDASC SENSOR Lab.
    Sberveglieri, G.
    CNR IDASC SENSOR Lab.
    CdSe spherical quantum dots stabilised by thiomalic acid: Biphasic wet synthesis and characterisation2011Inngår i: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 12, nr 4, s. 863-870Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    CdSe quantum dots stabilised by thiomalic acid have been synthesised by an aqueous biphasic ligand exchange reaction in air. The materials are completely water-soluble and were found to be stable over a long time. X-ray diffraction and transmission electron microscopy reveal the formation of CdSe nanocrystals with cubic structure (a=0.6077 nm; spatial group: F-43m). The average particle size is about 5 nm. Energy dispersive X-ray analysis shows that the nanocrystals are nonstoichiometric, with a Cd/Se ratio varying between 60/40 and 70/30, and indicates the presence of Cd2+ ions at the nanocrystal surface. Diffuse reflectance infrared Fourier transform measurements suggest that thiomalic acid chelates CdSe through the thiol group and one carboxylic function, while the second COOH group is semi-free. A complex-like structure is proposed, in which thiomalic acid forms a five-membered chelate ring with the Cd2+ ions present on the nanocrystal surface. Chelate effect accounts for the easiness of ligand exchange and is expected to additionally stabilise the nanosystem. Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.

  • 2.
    Devaux, Xavier
    et al.
    Institut Jean Lamour, Department P2M, UMR 7198 CNRS–Université de Lorraine, Ecole des Mines, 54042 Nancy.
    Vigolo, Brigitte
    Institut Jean Lamour, CNRS – Nancy Université, Laboratoire de Chimie du Solide Minéral, Nancy Université.
    McRae, Edward
    Institut Jean Lamour, CNRS – Nancy Université, Laboratoire de Chimie du Solide Minéral, Nancy Université.
    Valsaque, Fabrice
    Institut Jean Lamour, Nancy Universite.
    Allali, Naoual
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Mamane, Victor
    Laboratoire de Synthèse Organométallique et Réactivité, Université Henri Poincaré - Nancy, Laboratoire de Structure et Réactivité des Systèmes Moléculaires Complexes, Nancy Université.
    Fort, Yves
    Laboratoire de Structure et Réactivité des Systèmes Moléculaires Complexes, UMR 7565 CNRS–Université de Lorraine, 54506 Vandoeuvre-les-Nancy, Laboratoire de Synthèse Organométallique et Réactivité, Université Henri Poincaré - Nancy.
    Soldatov, Alexander
    Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, Materialvetenskap.
    Dossot, Manuel
    Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, Nancy Université, Laboratoire de Chimie Physique et Microbiologie pour l'Environnement, UMR 7564, CNRS–University of Lorraine.
    Tsareva, Svetlana Yu.
    Institut Jean Lamour, Nancy Universite.
    Covalent Functionalization of HiPco Single-Walled Carbon Nanotubes: Differences in the Oxidizing Action of H2SO4 and HNO3 during a Soft Oxidation Process2015Inngår i: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 16, nr 12, s. 2692-2701Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    The results of a study on the evolution of HiPco single-walled carbon nanotubes during the oxidizing action of H2SO4 and HNO3 are presented. The process conditions used have been chosen so as to avoid any significant damage to the nanotube structure. The type and level of functionalization, the location of the grafted functions on the surface of the nanotube and the changes in morphological characteristics of the samples were examined by using a wide and complementary range of analytical techniques. We propose an explanation for the differences in the oxidizing action of sulfuric and nitric acids. The combined results allow us to suggest possible reaction mechanisms that occur on the surface of the nanotube.

  • 3.
    O'Byrne, Justin P.
    et al.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Li, Zhong
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Jones, Sarah Louise T.
    Electronics Theory Group, Tyndall National Institute, Cork.
    Fleming, Peter G.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Larsson, Andreas
    Morris, Michael A.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Holmes, Justin D.
    Department of Chemistry, Tyndall National Institute, University College Cork.
    Nitrogen-doped carbon nanotubes: Growth, mechanism and structure2011Inngår i: ChemPhysChem, ISSN 1439-4235, E-ISSN 1439-7641, Vol. 12, nr 16, s. 2995-3001Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    Nitrogen-doped bamboo-structured carbon nanotubes have been successfully grown using a series of cobalt/molybdenum catalysts. The morphology and structure of the nanotubes were analysed by transmission electron microscopy and Raman spectroscopy. The level of nitrogen doping, as determined by X-ray photoelectron spectroscopy, was found to range between 0.5 to 2.5 at. %. The growth of bamboo-structured nanotubes in the presence of nitrogen, in preference to single-walled and multi-walled nanotubes, was due to the greater binding energy of nitrogen for cobalt in the catalyst compared to the binding strength of carbon to cobalt, as determined by density functional theory

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