CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

3+
Fig.59. Schematic diagram of Eu species present on the surface of the GaPO nanoparticles.
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For understanding the nature of interaction of ligands (glycerol molecule) with the
surface Ga 3+ /Eu 3+ species present in GaPO 4 nanoparticles, FT-IR spectra were recorded for
both GaPO 4 nanoparticles and GaPO nanoparticles containing 2.5 at % Eu 3+
4 ions and are
shown in Fig.60. Both the patterns are identical with peak positions around 3403, 2948, 2117,
2356 and 1654 cm -1 as can be seen from Fig.60. In fact, the spectra for the 5 and 10 atom %
Eu 3+ containing samples are also same as that of undoped GaPO 4 nanoparticles. The peaks
centered around 3403 and 1654 cm -1
correspond to stretching and bending vibrations
respectively of O-H groups present on the surface of the nanoparticles as well as from
glycerol molecule [240]. The less intense peak ~ 2948 cm -1 is assigned to asymmetric and
symmetric stretching vibrations of C-H linkages of the stabilizing glycerol molecules. The
weak peaks around 2117 and 2356 cm -1 can be considered as the overtones of the δ(OH)
bending vibrations [241]. There is no change in the line shape and peak positions of the peaks
corresponding to the different vibrational modes of the ligand molecules present with both
undoped and 2.5 at % Eu 3+ containing GaPO nanoparticles. This suggests that Eu 3+ ions do
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