Structure and stability of nickel/nickel oxide core-shell nanoparticles

Banca dati: Codice: Altro Abstract Lingua altro abstract Parole Chiave (separate da ,) Descrizioni Altre informazioni Dato storico proveniente da Gestione Istituti: Note: DOI: 10.1088/0953-8984/23/17/175003 Inquadramento nell'ambito delle attività scientifiche europee Progetti Europei Inquadramento nell'ambito delle attività scientifiche dell'ente Strutture CNR * NANO - Istituto Nanoscienze Moduli CNR * MD.P06.013.002 - Nanofabbricazione e fenomeni di superficie interfaccia alla nanoscala File allegati File allegati Aggiungi annulla Home Gestione Prodotti | Mini-sito Istituto IMEM | Aiuto Dati importabili dal documento WoS [000289555700005]close Titolo Structure and stability of nickel/nickel oxide core-shell nanoparticles Anno 2011 Autori D'Addato, S.; Grillo, V.; Altieri, S.; Tondi, R.; Valeri, S.; Frabboni, S. Affiliazioni CNR Ist Nanosci; Universita di Modena e Reggio Emilia; CNR IMEM DOI 10.1088/0953-8984/23/17/175003 ISSN 0953-8984 ISBN Volume 23 Numero Fascicolo 17 Pagine da Pagine a Pagine totali 7 Lingua prodotto Abstract The results of a combined x-ray photoelectron spectroscopy (XPS) and high resolution transmission electron microscopy (HR-TEM) study of Ni nanoparticles (NP), before and after oxidation, are presented. An experimental set-up was realized for the preparation and study of pre-formed NP films, concentrating the attention on Ni NP in the diameter range between 4 and 8 nm. The XPS data were taken in situ from NPs after different stages of oxidation, including controlled dosing of O-2 gas in the experimental system and exposure to the atmosphere. The Ni 2p structure is a combination of spectra from metallic Ni in the NP core and from the oxide shell. The signal from the NP core was observed even for samples after exposure to air. From the comparison of HR-TEM experimental images with theoretical simulations, it was found that the Ni NP core has a regular multitwinned icosahedral structure, composed of single-crystal tetrahedra with (111) faces. The NiO phase is clearly observed forming islands on the NP surface.