CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

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ACKNOWLEDGEMENTS I express my deep and sincere gratitude to my guide, Prof. (Dr.) V. K. Jain for his invaluable guidance, constant encouragement, keen interest and good wishes. I am also grateful to him for being patient while critically reviewing this thesis. This thesis would not have been possible without the guidance, help, support, critical analysis and valuable suggestions from my co-guide Dr. V. Sudarsan. His enthusiasm, deep engagement in research and critical analysis of experimental data has made a deep impression on me. For his invaluable support both on academic and personal fronts, I am extremely grateful to him. It gives me pleasure to place on record my sincere thanks to Dr. T. Mukherjee, Director, Chemistry Group, Dr. D. Das, Head, Chemistry Division and Dr. R. K. Vatsa, Head, Structural Chemistry Section for giving me an opportunity to work with a dedicated and learned team of scientists and for constant encouragement during the course of present investigation. I am thankful to Dr. S. K. Ghosh, Dean of Academics, Chemical Sciences, HBNI for his help, support and constant encouragement right from the beginning of the Training School, BARC. I am grateful to HBNI for giving me this opportunity, providing funding and fellowship during this course of work. I take this opportunity to thank Mr. B. Vishwanadh, Dr. R. Tewari, of Material Science Division, BARC, Prof. P. V. Satyam, Institute of Physics, Bhuvaneswar for their help in providing TEM data. Thanks are due to Mr. Jitendra Nuvad and Dr. C.G.S.Pillai, for SEM measurements and Dr. M. Pandey for Raman measurements. I would like to acknowledge Drs. R. S. Ningthoujam, Sandeep Nigam, O. D. Jayakumar and R. Sashikala, Anshu Singhal who helped me in various ways and their cooperation during the course of this work. I am vi
also thankful to all the members of Structural Chemistry Section for their help and cooperation. My special thanks to my classmate, my dear friend K. Srinivasu for his moral support, diversified help and continuous encouragement. I wish to thank my friends Vishwanadh, Siddharth, Dinesh, Bhanu, Vijay, Jerina Farheen, Sunil, Shyam, Murthy, Vishnu, Srinu, Naresh, Raghavendra and Prabhat for their help, close companionship and constant inspiration. Finally, I convey my heartfelt gratitude to my family and beloved elder brother Ramu Naidu who have always encouraged me to follow my heart and inspired my inquisitive mind throughout my childhood and study career. Their inspiration, encouragement, blessings and support have helped me to achieve what I am today. Mumbai July 2011 <strong>Sanyasinaidu</strong> <strong>Boddu</strong> vii
Page 1 and 2: SYNTHESIS AND CHARACTERIZATION OF L
Page 3 and 4: STATEMENT BY AUTHOR This dissertati
Page 5: Dedicated to ……… My beloved b
Page 9 and 10: 2.3 Synthesis of binary oxide nanom
Page 11 and 12: CHAPTER 5: Zinc Gallate ...........
Page 13 and 14: imaging, scintillators, lasers, etc
Page 15 and 16: morphology by heating at 500 and 90
Page 17 and 18: nanoparticles having hexagonal stru
Page 19 and 20: 100°C and 185°C, respectively in
Page 21 and 22: into poly methyl methacryllate (PMM
Page 23 and 24: 3. N. M. Dimitrijevic, Z. V. Saponj
Page 25 and 26: Fig.13: Fig.14: (a) Simplified ray
Page 27 and 28: Eu 3+ ions after heat treatment at
Page 29 and 30: 615 nm Fig.50: FT-IR patterns (a) a
Page 31 and 32: area electron diffraction pattern a
Page 33 and 34: different amounts of Eu 3+ . Fig.86
Page 35 and 36: and 545 nm, respectively. Fig.106:
Page 37 and 38: List of Tables: Table 1: Variation
Page 39 and 40: CHAPTER 1: Introduction 1.1 Histori
Page 41 and 42: Rods, cylinders, wires and tubes ar
Page 43 and 44: must be supersaturated either by di
Page 45 and 46: - + - + charge stabilized nanoparti
Page 47 and 48: exothermic reaction between the met
Page 49 and 50: constant, ħ is h/2π, e is the ele
Page 51 and 52: these platinum complexes have been
Page 53 and 54: (IR), visible and ultra-violet (UV)
Page 55 and 56: in Ce 3+ , Pr 3+ , Tb 3+ and CT abs
Page 57 and 58:
assisted by lattice phonons of appr
Page 59 and 60:
decay-time reduction is much easier
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nanocrystals is shown in Fig.10 [58
Page 63 and 64:
depends strongly on the nature of t
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corresponding emission and excitati
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doped nanomaterials of the above me
Page 69 and 70:
will be formed and subsequently it
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Eu 3+ ions were also subjected to s
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transferred into a two-necked RB fl
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Where λ is the wavelength of X-ray
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Micro-structural characterization b
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electrons (i.e. diffraction mode).
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diffraction spots. By tilting a cry
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surface. The contact mode can obtai
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three types lines in the scattered
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solids tend to be broadened because
Page 89 and 90:
sample fluoresce. The fluorescent l
Page 91 and 92:
pulse frequency) as excitation sour
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Lanthanide ions doped Ga 2 O 3 nano
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atoms at three corners and the lone
Page 97 and 98:
Figure 19 (a-d) shows SEM images of
Page 99 and 100:
Based on these results, it can be i
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almost normal to the equatorial pla
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Table 2. Summary of important modes
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systematic disappearance of these t
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comparison, Eu 3+ ions alone in wat
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the samples, suggesting that Eu 3+
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These inferences are further substa
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Similar DTA peaks have been reporte
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GaOOH samples doped with different
Page 117 and 118:
The cell parameters increases with
Page 119 and 120:
strong emission compared to corresp
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curves are shown in Fig.39. Lifetim
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Similar results are also observed f
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intensity of XRD peaks correspond t
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compared to the bulk material and a
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is almost 1½ times that of peak B1
Page 131 and 132:
3.8 Interaction of Eu 3+ ions with
Page 133 and 134:
The spectrum shows strong emission
Page 135 and 136:
The decay curves are found to be bi
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As prepared undoped Sb 2 O 3 sample
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Intensity(arb.units) 1.0 0.8 0.6 0.
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3+ having surface lanthanide ions.
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diffraction patterns from the GaPO
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5 D 0 7 F 2 level to 7 F 7 7 1 , F
Page 147 and 148:
The second possibility is the excha
Page 149 and 150:
chemical shift anisotropy is much h
Page 151 and 152:
not have strong interaction with th
Page 153 and 154:
(001) (110) (011) (101) (020) (101)
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growth centre compared to higher vi
Page 157 and 158:
observed after excitation at 250 an
Page 159 and 160:
3+ 3+ concentration quenching. Tb l
Page 161 and 162:
Compared to the selected area elect
Page 163 and 164:
lattice. Lanthanide ions occupying
Page 165 and 166:
obtained after 275 nm excitation is
Page 167 and 168:
The luminescence dynamics associate
Page 169 and 170:
that the broad peak can be resolved
Page 171 and 172:
espectively. Value of this integral
Page 173 and 174:
ethylene glycol moiety (stabilizing
Page 175 and 176:
Room temperature and 100°C synthes
Page 177 and 178:
heavier metal ion as compared to La
Page 179 and 180:
Similar studies were also carried o
Page 181 and 182:
3+ 3+ faster decay component is ass
Page 183 and 184:
the other hand the Eu 3+ lifetime h
Page 185 and 186:
3+ 4.4.8 Luminescence studies on Sm
Page 187 and 188:
CHAPTER 5: Zinc gallate (ZnGa 2 O 4
Page 189 and 190:
In pure EG an amorphous product is
Page 191 and 192:
water content in the reaction mediu
Page 193 and 194:
nucleation, thereby leading to incr
Page 195 and 196:
particles. Thus the TEM studies als
Page 197 and 198:
value. The lattice parameters calcu
Page 199 and 200:
Quantum yield of the blue emission
Page 201 and 202:
5.5.2. Eu 3+ doped ZnGa 1.5 In 0.5
Page 203 and 204:
CHAPTER 6: Tungstates [MWO 4 (M = C
Page 205 and 206:
ionic radius of the metal cation ca
Page 207 and 208:
lattice. Asymmetric ratio is ~ 12 f
Page 209 and 210:
700 Intensity (arb.units) 600 λ ex
Page 211 and 212:
Intensity (arb.units) 25000 20000 1
Page 213 and 214:
Strong green emission has been obse
Page 215 and 216:
consists of strong band at 255 nm a
Page 217 and 218:
peak can be attributed to the cryst
Page 219 and 220:
nm) is observed from Er 3+ doped Ga
Page 221 and 222:
and Dy 3+ doped CaWO 4 nanoparticle
Page 223 and 224:
REFERENCES 1. D. J. Barber, I. C. F
Page 225 and 226:
32. K. A. Gschneidner, Jr., L. Eyri
Page 227 and 228:
65. Z. Deng, F. Tang, D. Chen, X. M
Page 229 and 230:
100. A. Rouanel, J. J. Serra, K. Al
Page 231 and 232:
130. F. Li, W. Jianhuai, L. Jiongti
Page 233 and 234:
166. L. Fu, Z. Liu, Y. Liu, B. Han,
Page 235 and 236:
205. R. Sasikala, V. Sudarsan, C. S
Page 237 and 238:
238. E. Oldfield, R. A. Kinsey, K.
Page 239 and 240:
271. B. G. Hyde, S. Andersson, ”I
Page 241 and 242:
B. S. Naidu, B. Vishwanadh, V. Suda
Page 243:
9. Room temperature synthesis of mu
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CHEM01200604004 Shri Sanyasinaidu Boddu - Homi Bhabha ...

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