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hcp and fcc Nickel Nanoparticles Prepared from Organically Functionalized Layered Phyllosilicates of Nickel(II)

Richard-Plouet, Mireille and Guillot, Murielle and Vilminot, Serge and Leuvrey, Cédric and Estournès, Claude and Kurmoo, Mohamedally hcp and fcc Nickel Nanoparticles Prepared from Organically Functionalized Layered Phyllosilicates of Nickel(II). (2007) Chemistry of Materials, vol.19 (n° 4). pp. 865-871. ISSN 0897-4756

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Official URL: http://dx.doi.org/10.1021/cm062521c

Abstract

We report on the formation of air-stable fcc Ni nanoparticles via the rarely observed metastable hcp Ni from two organically modified layered Ni(II) phyllosilicates at a moderately low temperature of less than 573 K in an inert atmosphere. The presence of hcp Ni as an intermediate is related to the organization of the nickel atoms within the layers of the phyllosilicates, which is a triangular network with Ni-Ni distances of 3.2 Å protected by a strong covalent Si-O network on each surface. Characterizations of the products were performed by TG-DTA coupled to mass spectroscopy, in situ X-ray diffraction, electron microscopy, infrared, and in situ magnetization measurements. TEM shows that the fcc Ni particles are spherical and that the size (average of ca. 20 nm) depends on the starting phyllosilicate. Given that the amount of reduced Ni is proportional to the organic content and not to the Ni content of the phyllosilicates when the atmosphere is inert, we propose that the reduction takes place by the gases produced during the decomposition of the organic moiety. The stabilization of the hcp Ni phase depends on the percentage of Si-O coverage of the surface.

Item Type:Article
Additional Information:Thanks to American Chemical Society editor. The definitive version is available at http://pubs.acs.org The original PDF of the article can be found at Chemistry of Materials website : http://pubs.acs.org/journal/cmatex
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Other partners > Université de Nantes (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Louis Pasteur-Strasbourg I - ULP (FRANCE)
French research institutions > Centre National de la Recherche Scientifique - CNRS
Laboratory name:
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Deposited By: Celine Cabaup

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