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TITLE
DEDICATION
CERTIFICATE
DECLARATION
ACKNOWLEDGEMENT
CONTENTS
PREFACE
1. THE NEW ALCHEMY AND THE WORLD OF NEGLECTED DIMENSIONS
1.1 Emerging World of Materials Science and Technology
1.2 History of Nanostructured Materials
1.3 Nanophase Regime
1.4 Unique Properties of Nanocrystalline Materials
1.5 Synthesis of Nanocrystalline Materials
1.6 Techniques for Characterization of Nanocrystalline Materials
1.7 Improved Properties and Applications of Nanocrystalline Materials
1.8 A Look into the Future
1.9 Scope of the Present Study
1.10 References
2. EXPERIMENTAL TECHNIQUES
2.1 Introduction
2.2 Chemical Arrested Precipitation Method
2.3 Thermogravimetric Analysis
2.4 Differential Scanning Calorimetry
2.5 Fourier Transform Infrared Spectroscopy
2.6 X-ray Diffraction
2.7 Transmission Electron Microscopy
2.8 Study of Electrical Properties
2.8.1 Measurement of dc Conductivity
2.8.2 Measurement of Dielectric Constant, Dielectric Loss and ac Conductivity
2.9 Impedance Spectroscopy
2.10 References
3. SYNTHESIS AND CHARACTERIZATION OF NANOPHASE SAMPLES
3.1 Introduction
3.2 Preparation of Nanophase Materials for the Present Study
3.2.1 Preparation of nano-ZnO and nano-CdO
3.2.2 Preparation of nano-Al2O3
3.2.3 Preparation of Silver Nanoparticles
3.3 Thermogravimetric Analysis of the Precursor Powders
3.4 X-ray Diffraction Studies
3.5 Transmission Electron Microscopy
Fig. 3.10 TEM Micrographs and Electron Diffraction Pattern of nanoparticles of ZnO
3.6 Differential Scanning Calorimetry
3.7 Fourier Transform Infrared Spectroscopic Study of nano-ZnO
3.8 Conclusion
3.9 References
4. DC ELECTRICAL CONDUCTIVITY OF NANOPHASE ZnO AND ZnO-Al2O3, ZnO-Ag AND ZnO-CdO NANOCOMPOSITES
4.1 Introduction
4.2 Experimental
4.2.1 Sample Preparation
4.2.2 Conductivity Measurements
4.3 Results
4.4 Discussion
4.4.1 Conductivity of nano-ZnO
4.4.2 Conductivity of ZnO-Al2O3 Nanocomposites
4.4.3 Conductivity of ZnO-Ag Nanocomposites
4.4.4 Conductivity of ZnO-CdO Nanocomposites
4.5 Conclusion
4.6 References
5. IMPEDANCE SPECTROSCOPIC ANALYSIS OF AC RESPONSE OF NANOPHASE ZnO AND ZnO-AL2O3 NANOCOMPOSITES
5.1 Introduction
5.2 Experimental
5.3 Results and Discussion
5.4 Conclusion
5.5 References
6. IMPEDANCE SPECTROSCOPIC ANALYSIS OF ZnO-Ag NANOCOMPOSITES
6.1 Introduction
6.2 Experimental
6.3 Results and Discussion
6.4 Conclusion
6.5 References
7. IMPEDANCE SPECTROSCOPIC STUDIES OF ZnO-CdO NANOCOMPOSITES
7.1 Introduction
7.2 Experimental
7.3 Results and Discussion
7.4 Conclusion
7.5 References
8. AC ELECTRICAL PROPERTIES OF NANOPHASE ZnO AND ZnO-Al2O3 NANOCOMPOSITES
8.1 Introduction
8.2 Experimental
8.3 Results
8.4 Discussion
8.4.1 Dependence of Dielectric Constant (ε’) on Frequency, Temperature and Composition
8.4.2 Dependence of Dielectric Loss Factor (tans δ) on Frequency, Temperature and Composition
8.4.3 ac Conductivity
8.5 Conclusion
8.6 References
9. AC ELECTRICAL PROPERTIES OF ZnO-Ag NANOCOMPOSITES
9.1 Introduction
9.2 Experimental
9.3 Results and Discussion
9.3.1 Dielectric Constant (ε)
9.3.2 Dielectric Loss Factor (tanδ)
9.3.3 ac conductivity (σac)
9.4 Conclusion
9.5 References
10. AC ELECTRICAL PROPERTIES OF ZnO-CdO NANOCOMPOSITES
10.1 Introduction
10.2 Experimental
10.3 Results and Discussion
10.3.1 Dielectric Constant (ε)
10.3.2 Dielectric Loss Factor (tanδ)
10.3.3 Electrical Conductivity (σac)
10.4 Conclusion
10.5 References