Abstract
In this paper, we report the synthesis and characterization of CeO2
nanocrystals dispersed into a porous Vycor glass. We analyzed the
nanocrystal structural properties using X-ray diffraction, Raman
spectroscopy and transmission electron microscopy (TEM). The size of the
nanocrystals is controlled via the mass increment only and the matrix
plays an important role in controlling the nanocrystal size because it
prevents the coalescence process. Coalescence control is attributed to
nanocrystal dispersion into the host and to the terminal bonds present
in the pores that act as anchors, thus resulting in a low diffusion of
the nanocrystals through the porous network. We have determined a Raman
frequency dependence on the nanocrystal size which is quite useful for a
quick check of the size of CeO, nanocrystals. (c) 2007 Elsevier Ltd. All
rights reserved.
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