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Nickel nanostructured materials from liquid phase photodeposition
Authors:Salvatore Giuffrida  Guglielmo G Condorelli  Lucia L Costanzo  Giorgio Ventimiglia  Raffaella Lo Nigro  Maria Favazza  Enrico Votrico  Corrado Bongiorno  Ignazio L Fragalà
Institution:(1) Dipartimento di Scienze Chimiche, Universitá degli Studi di Catania and INSTM UdR di, Catania, V.le A. Doria 6, 95125 Catania, Italy;(2) IMM-CNR, stradale Primosole 50, 95121 Catania, Italy
Abstract:Liquid Phase Photo-Deposition (LPPD) technique has been used to obtain both colloidal particles and thin films of metallic and chloride nickel from solutions of only precursor Ni(acac)2 (acac=2,4-pentandionato). Metallic nickel was obtained from ethanol solutions by direct nickel(II) photoreduction at 254 nm and by acetone sensitised reaction at 300 nm. In this latter process the rate was higher than in the first one. NiCl2 was formed from CCl4 solution by a solvent-initiated reaction. TEM analysis, performed on colloidal particles of nickel, showed that their dimensions are in the range 2–4 nm. The films did not present carbon contamination and were characterized by AFM, XPS and GIXRD. Metallic films consisted of particles of 20–40 nm that are the result of the aggregation of smaller crystallites (4–5 nm). Larger agglomerations (around 200 nm) have been observed for NiCl2 films.
Keywords:Ni(2  4-pentandionato)2            nanoparticles  films  photochemistry  metallic Nickel  Nickel chloride  agglomeration  colloids
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