Characterization of Raman spectra in nano-SnO2 solids

Influence of Post Annealing on SnO2 Nanoparticles and its Photocatalytic Activity in Methylene Blue Dye Degradation

“…In the nanocrystalline SnO2 based system, as the surface properties are sensitive not only to the grain size and their distributions but also to the oxygen vacancies and local disorder, there may be a possibility of the appearance of new modes in the Raman spectra 19,20 . The Raman peaks' data are found to be comparable with those available in the literature 21,22 . Further, a continuous detraction of the FWHM of Raman peaks with increasing crystallite size observed in the samples of the present investigation may be due to phonon confinement effect, and such a phenomenon was reported earlier in many nanocrystalline materials such as TiO2, ZnO, CeO2, etc.…”

The complete Raman spectrum of nanometric SnO2 particles

“…34 Despite the number of publications related to SnO 2 and Raman spectroscopy, however, they have not generally been reported for SnO 2 . [12][13][14][15] An exception to this is our previous paper 11 in which we demonstrated them to be an effective way of evaluating not only the average nanoparticle size, but also the whole size distribution.…”

“…Low frequency bands have been observed previously in SnO 2 , 11 and several authors have reported the existence of bands not observed in single-crystal or polycrystalline SnO 2 which have been found to be closely related to grain size. [12][13][14][15] However, some of these reports do not adequately explain the origin of the abnormal spectrum.…”

Structural Characterization of Nanocrystalline SnO2by X-Ray and Raman Spectroscopy

“…For instance, the p band in Fig. 2 of ref 9 at 576 cm\ which grows when the size of the SnO particles decreases is attributed to surface modes (9). In this respect a perfect linear correlation between the relative intensity of the surface modes centered on 572 cm\ and the number of surface atoms can be deduced from Figs.…”

“…Since the early IR study of Luxon and Summitt (6) on 0.5-m spherical particles of SnO , it has been amply demonstrated (7) that the position, intensity, and width of the IR bands of microcrystalline SnO particles are strongly affected by the shape and the state of aggregation. In the same way, several Raman studies report on the relationship between the size and the spectral changes in nanocrystallites of SnO (8)(9)(10). The aim of the present work is to characterize by X-ray diffraction and Raman spectroscopy the crystalline structural changes and the real microstructure of various nanocrystalline SnO samples as powders and as layers prepared following different routes.…”