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Resonant raman scattering in CdSxSe1-x nanocrystals : effects of phonon confine...
Freitas Neto, E. S.; Silva, S. W. da; Morais, P. C.; Vasilevskiy, Mikhail; Silva, M. A. Pereira da; Dantas, N. O.Optical phonon modes confined in CdSxSe1-x nanocrystal (NC) quantum dots (≈ 2 nm in radius) grown in a glass matrix by the melting-nucleation method, were studied by means of resonant Raman scattering (RRS)spectroscopy and theoretical modelling. The formation of nanocrystalline quantum dots (QDs) is evidenced by the observation of absorption peaks and theoretically expected resonance bands in the RRS excitation...
Propane oxidation on Pt-WO3/gamma -AL2O3 catalytic systems
Silva,M.A.Pereira da; Cardoso,R.M.; Schmal,M.The oxidation of propane on was studied with Pt-xWO3/Al2O3 catalysts was studied ,by varying the concentration of tungsten sublayer. Thermal analysis and XRD in situ showed that the enrichment of tungsten at the surface is associated with the formation of HxWO3 bronze. FTIR results with C3H8 and O2 indicated that the catalyst surface properties and the interaction between W and Pt were modified. These modified ...
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