Inorganic Chemistry in a Nanoreactor: Doped ZnO Nanostructures by Miniemulsion

Authors

  • Paolo Dolcet,

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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  • Francesca Latini,

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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  • Maurizio Casarin,

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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  • Adolfo Speghini,

    1. Dipartimento di Biotecnologie, Università degli Studi di Verona and INSTM, UdR Verona, Strada Le Grazie 15, 37134 Verona, Italy
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  • Eugenio Tondello,

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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  • Cristina Foss,

    1. Department of Industrial Engineering and Biotech Research Center, University of Trento, 38100 Trento, Italy
    2. European Institute of Excellence on Tissue Engineering and Regenerative Medicine, and INSTM, 38100 Trento, Italy
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  • Stefano Diodati,

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
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  • Lucia Verin,

    1. Department of Industrial Engineering and Biotech Research Center, University of Trento, 38100 Trento, Italy
    2. European Institute of Excellence on Tissue Engineering and Regenerative Medicine, and INSTM, 38100 Trento, Italy
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  • Antonella Motta,

    1. Department of Industrial Engineering and Biotech Research Center, University of Trento, 38100 Trento, Italy
    2. European Institute of Excellence on Tissue Engineering and Regenerative Medicine, and INSTM, 38100 Trento, Italy
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  • Silvia Gross

    1. Dipartimento di Scienze Chimiche, Università degli Studi di Padova, via Marzolo 1, 35131 Padova, Italy
    2. Istituto di Scienze e Tecnologie Molecolari, ISTM-CNR and INSTM, UdR Padova, via Marzolo 1, 35131 Padova, Italy, http://www.chimica.unipd.it
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Abstract

Doped M:ZnO nanoparticles (Zn/M = 50:1 or 20:1; M = AgI, CoII, CuII, EuIII, MgII, MnII) have been produced by an easy, reproducible, and fast inverse miniemulsion approach, enabling the co-precipitation of the nanocrystalline oxide in a confined space. Unexpectedly, the formation of crystalline materials took place at room temperature. Suspensions were characterized by dynamic light scattering and UV/Vis spectroscopy, whereas precipitated powders were characterized by X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma atomic emission spectrometry, and thermogravimetric analysis. The particles obtained showed preferential growth along the [0002] direction with a size of 70 nm, whereas along the other directions average sizes of between 26 and 33 nm were determined. The analyses confirmed successful doping in all cases but one: In fact, the Ag-doped sample is a nanocomposite consisting of metallic silver clusters dispersed in the ZnO matrix. Red emission from the ZnO:Eu sample was evidenced upon excitation at around 465 nm.

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