NDLI: XRD, TEM and <sup>29</sup>Si MAS NMR study of sol-gel ZnO-SiO<sub>2</sub> nanocomposites

Content Provider	Royal Society of Chemistry (RSC)
Author	Lai, Adolfo Piccaluga, Giorgio Cannas, Carla Musinu, Anna Casu, Mariano
Copyright Year	1999
Abstract	X-Ray amorphous ZnO nanoparticles homogeneously dispersed in a silica matrix were evidenced in ZnO-SiO 2 nanocomposites obtained by a sol-gel method and heated to 700 °C. TEM observations indicated that the particle size slowly increases with temperature and zinc oxide content, reaching an upper limit of 12 nm. Through a comparison of the 29 Si MAS NMR data of the nanocomposites and silica samples, obtained by the same preparation method, it was possible to observe that reaction occurs between ZnO and silica on heating, which causes a depolymerization of the host matrix with the formation of low condensation groups. This result is discussed in terms of interactions between nanoparticles and the silica matrix at the nanoparticle/matrix interface. A further increase in temperature (900 °C) results in the formation of the β-Zn 2 SiO 4 crystalline phase.
Starting Page	1765
Ending Page	1769
Page Count	5
File Format	PDF
ISSN	09599428
Volume Number	9
Issue Number	8
Journal	Journal of Materials Chemistry
DOI	10.1039/a901001g
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Silicon dioxide Composite material Sol\u2013gel process Transmission electron microscopy Zinc oxide Magic angle spinning Nuclear magnetic resonance Nanoparticle
Content Type	Text
Resource Type	Article
Subject	Chemistry Materials Chemistry

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XRD, TEM and ²⁹Si MAS NMR study of sol-gel ZnO-SiO₂ nanocomposites