PHYS01200704032 Debes Ray - Homi Bhabha National Institute

Figure 4.2. UV-visible absorption spectra of the samples of 1 wt% P85 with varying
concentration of HAuCl 4 .3H 2 O in aqueous solution.
Figure 4.3. (a) The gold salt concentration normalized SPR peak in UV-visible absorption
spectra of 1 wt% P85 with varying concentration of HAuCl 4 .3H 2 O in aqueous solution.
(b) Variation of SPR peak absorbance in UV-visible absorption spectra.
Figure 4.4. (a) TEM image of gold nanoparticles in 1 wt% P85 + 0.008 wt% HAuCl 4 .3H 2 O.
Inset shows the calculated nanoparticle size distribution. (b) TEM image of gold
nanoparticles in 1 wt% P85 + 0.016 wt% HAuCl 4 .3H 2 O.
Figure 4.5. Time-dependent UV-visible absorption spectra of 1 wt% P85 with 0.008 wt%
HAuCl 4 .3H 2 O. The different data sets from bottom to top correspond to increase in the
absorbance with time. Inset: The variation of the integrated absorbance of SPR peak as a
function of time.
Figure 4.6. SANS data of 1 wt% P85 with varying concentration of HAuCl 4 .3H 2 O in
aqueous solution. The solid curve is a theoretical fit to the experimental data.
Figure 4.7. Plots of the intensity autocorrelation functions in DLS data of 1 wt% P85 with
varying concentration of HAuCl 4 .3H 2 O in aqueous solution. The solid curve is a theoretical
fit to the experimental data.
Figure 4.8. UV-visible spectra of (a) 0.5 wt% and (b) 2 wt% P85 with varying HAuCl 4 .3H 2 O
concentration.
Figure 4.9. UV-visible spectra of gold nanoparticles corresponding to the maximum yield for
block copolymer concentrations of 0.5, 1 and 2 wt%.
Figure 4.10. (a) The variation of HAuCl 4 .3H 2 O concentration required for the maximum
yield with block copolymer concentration. (b) The variation of SPR peak absorbance with the
increase in the block copolymer concentration.
Figure 4.11. Comparison of integrated intensity of SPR peaks as a function of time for 0.5, 1
and 2 wt% P85 at their corresponding gold salt concentrations of maximum yield. All these
data show three different regions (i) Formation, (ii) Saturation and (iii) Stability. Inset:
Enlarged view of the formation region of the gold nanoparticles.
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