PHYS01200704032 Debes Ray - Homi Bhabha National Institute

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[HAuCl 4 .3H 2 O] at max. yield (wt %) Absorbance Chapter 4: Optimization of the Block Copolymer-mediated Synthesis of Gold Nanoparticles 1.6 1.2 2 wt% P85 + 0.016 wt% HAuCl4.3H2O 1 wt% P85 + 0.008 wt% HAuCl4.3H2O 0.5 wt% P85 + 0.004 wt% HAuCl4.3H2O 0.8 0.4 200 400 600 800 Wavelength (nm) 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%. (a) 0.016 0.012 0.008 0.004 0.4 0.8 1.2 1.6 2.0 [P85] (wt%) 98
SPR peak absorbance Chapter 4: Optimization of the Block Copolymer-mediated Synthesis of Gold Nanoparticles (b) 1.2 1.0 0.8 0.6 0.4 0.2 0.5 1.0 1.5 2.0 [P85] (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. The gold salt concentration at which the yield of the nanoparticles is the maximum with increasing block copolymer concentration shows a linear dependence as shown in Figure 4.10(a). This linear dependence arises as a result of the maximum yield decided by the minimum molar ratio of block copolymer-to-gold salt. The overall dependence of yield on block copolymer concentration is shown in Figure 4.10(b). It is clear that the dependence of resultant yield on block copolymer concentration (Figure 4.10(b)) does not follow the same trend to that of occurrence of maximum (Figure 4.10(a)). This could be due to formation of much larger-sized nanoparticles for higher block copolymer concentration consistent with the broader SPR peak at 2 wt% P85 and shift towards higher wavelength as compared to those of 0.5 and 1 wt% P85 concentrations. Thus the concentration-dependent enhancement of yield in this method is limited by the stability of the particles which has been further examined using time-dependent UV-visible spectroscopy. 99
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SYNTHESIS AND CHARACTERIZATION OF B
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STATEMENT BY AUTHOR This dissertati
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DECLARATION I, hereby declare that
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Acknowledgements I would like to ex
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2. BLOCK COPOLYMER-MEDIATED SYNTHES
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5. CORRELATING BLOCK COPOLYMER SELF
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SYNOPSIS OF THE THESIS TO BE SUBMIT
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synthesis for its dependence on gol
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interactions between the templating
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utilized in the formation of nanopa
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nanoparticle-protein conjugate conf
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LIST OF FIGURES Figure 1.1. The len
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Figure 4.2. UV-visible absorption s
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Figure 5.9. (a) Absorbance (Abs max
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Figure 7.5. Integrated absorbance o
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Chapter 1 Synthesis, Characterizati
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Chapter 1: Synthesis, Characterizat
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Chapter 2 Block Copolymer-mediated
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Chapter 2: Block Copolymer-mediated
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g I ()-1 Chapter 6: High-Yield Synt
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Absorbance Integrated Absorbance /
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Chapter 6: High-Yield Synthesis of
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Chapter 7: Interaction of Gold Nano
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d/d (cm -1 ) Absorbance Chapter 7:
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Integrated Absorbance / Yield (a.u.
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Absorbance Absorbance Chapter 7: In
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d/d (cm -1 ) Chapter 7: Interaction
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d/d (cm -1 ) d/d (cm -1 ) Chapter 7
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Chapter 8: Summary Chapter 1 introd
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Chapter 8: Summary hence synthesis.
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Chapter 8: Summary irrespective of
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24. R. Elghanian, J.J. Storhoff, R.
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69. J.F. Hainfeld, D.N. Slatkin, T.
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119. N.S. Cameron, M.K. Corbierre a
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165. J.H. Lambert, Photometria sive
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210. D. Ray and V.K. Aswal, Confere
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9. SANS Studies of Temperature-depe
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14. Multi-technique Approach for th
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PHYS01200704032 Debes Ray - Homi Bhabha National Institute

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