Abstract
Nanosized La–TiO 2 has been prepared by sol–gel and analyzed by TEM, XPS, ICP and XRD characterization techniques. The various techniques highlighted that La retarded the anatase-to-rutile transformation, hindered the grain growth and created Ti 3+ after calcinations at 900 °C. Lanthanum was segregated as La 4Ti 9O 24 in an inner surface layer when the formation of rutile occurred. XPS measurement showed an enrichment of the surface of the particles with La atoms and manifested the presence of La 2O 3. The gas test showed that the incorporation of 10 at.% of La resulted in a specially positive approach to a more selective ethanol sensor. The detection of alcohols aroused particular interest, since the materials calcined at high temperatures, i.e. 900 °C, showed a response to ethanol enhanced and quickened. Besides, this came along with the spoiling of the performances for CO detection.
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