CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

3+
4.3.3 Studies on Ce co-doped SbPO 4 :Tb 3+ nanomaterials and their dispersion in silica:
3+
Figure 68 shows TEM images of SbPO4:Ce (2.5%),Tb 3+ (5%) samples dispersed in SiO 2 .
The ribbons are shown in Fig.68 (a). Their length and width are in the range of 700-800 and
20-50 nm, respectively. In addition to these nanorods, nanoparticles of size 2-5 nm are also
present as revealed by the TEM image (Fig.68 (b)). Nanoribbons are aggregated and are
surrounded by silica, as can be seen from the contrast difference observed in the TEM image
arising due to the high refractive index of SbPO 4 compared to silica. Selected area diffraction
from the sample is shown in the Fig.68 (c).
(a)
(b)
(c)
(d)
3+
Fig.68. TEM images of (a) SbPO 4 :Ce (2.5%),Tb 3+ (5%) nanoribbons in silica and (b)
3+
SbPO4:Ce (2.5%),Tb 3+ (5%) nanoparticles in silica. A representative selected area
electron diffraction pattern and a high resolution TEM image from these nanoribbon
are shown in Fig.68 (c and d), respectively.
122