CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

diffraction, photoluminescence, Fourier transform infrared (FT-IR) and Raman spectroscopic
techniques.
3.2 Effect of urea concentration on size of GaOOH nanorods: GaOOH nanomaterials
were prepared by hydrolysis of gallium nitrate by urea. In order to find out the effect of
hydroxyl ion concentration on size and shape of GaOOH nanomaterials, different
concentrations of urea was used. Figure 18 shows the XRD patterns of as prepared samples
with different concentrations of urea. The patterns match very well with the orthorhombic
structure of GaOOH. Average crystal size was calculated using Deby-Scherrer formula and
found that the particle size increases with increasing concentration of urea from 28 nm (15
mmol) to 50 nm (180 mmol). This could be attributed to an increase in the rate of hydrolysis
by increasing concentration of urea. In order check whether the increase in extent of
hydrolysis is associated with change in the morphology, SEM measurements were carried out
on the samples prepared with different concentrations of urea.
180 mmol urea
Intensity (arb.units)
115 mmol urea
80 mmol urea
50 mmol urea
15 mmol urea
20 30 40 50
2θ/°
Fig.18. XRD patterns of GaOOH nanomaterials prepared with different amounts of urea.
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