The present study focuses on the structural properties of a NiO-SiO 2 nanocomposite with 14 mol % of nickel oxide obtained by a sol-gel method and a gradual heating the gel in the 350-900°C range. NiO nanoparticles and their dispersion in the amorphous silica matrix were studied through TEM and XRD. The behaviour at the nanoparticle/matrix interface was investigated through IR and 29Si MAS NMR spectroscopy comparing the spectra of the nanocomposite with that of a silica sample obtained with the same preparation method and submitted to the same thermal treatments. The results indicate that nanoparticles, formed in cavities of the silica matrix, act as an obstacle towards the spontaneous silica polymerization process with heat treatments.
XRD, TEM, IR and Si-29 MAS NMR characterization of NiO-SiO2 nanocomposites / M. Casu, A. Lai, A. Musinu, G. Piccaluga, S. Solinas, S. Bruni, F. Cariati, E. Beretta. - In: JOURNAL OF MATERIALS SCIENCE. - ISSN 0022-2461. - 36:15(2001), pp. 3731-3735.
XRD, TEM, IR and Si-29 MAS NMR characterization of NiO-SiO2 nanocomposites
S. Bruni;F. Cariati;
2001
Abstract
The present study focuses on the structural properties of a NiO-SiO 2 nanocomposite with 14 mol % of nickel oxide obtained by a sol-gel method and a gradual heating the gel in the 350-900°C range. NiO nanoparticles and their dispersion in the amorphous silica matrix were studied through TEM and XRD. The behaviour at the nanoparticle/matrix interface was investigated through IR and 29Si MAS NMR spectroscopy comparing the spectra of the nanocomposite with that of a silica sample obtained with the same preparation method and submitted to the same thermal treatments. The results indicate that nanoparticles, formed in cavities of the silica matrix, act as an obstacle towards the spontaneous silica polymerization process with heat treatments.
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