Abstract
The laser power effects on the structural properties of nanostructured
oxides were studied by Raman spectroscopy. The nanostructured CeO2,
ZrO2, SnO2, TiO2 and MnO oxides were prepared by a nanocasting route and
characterized through various physicochemical techniques. The structural
features of the solids were accompanied by varying the incident laser
power from 2.0 to 9.1 mW. The laser caused local heating on the surface
of the nanostructured solids and influenced on their particle sizes. The
CeO2, TiO2 and MnO spectra exhibited particle size changes due to
thermal effects. Elevated laser power up to 9.1 mW accelerated the
sintering of CeO2, TiO2 and MnOx particles in contrast to SnO2
counterparts. Simultaneously, the creation of defects in the aforesaid
oxide structures was suggested upon increasing the laser power from 2.0
to 9.1 mW. The phase transformation from MnO-related phases to
alpha-Mn2O3 and the oxidation of these phases were observed. Tetragonal
ZrO2 showed a very stable structure under laser heating, envisaging
further catalytic applications upon using mild laser power.
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