DEVELOPMENT OF CORE-SHELL METALLIC NANOPARTICLES FOR OPTO-ELECTRONICS
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The engineering and design of metal nanoparticles (MNPs) that possess unique size-dependent optical and electronic properties is a promising area of research. The aim of this thesis is to design and to prepare uniformly sized NPs which bear a dielectric shell that can exhibit desirable properties that can be utilized in solar cells and organic light emitting diodes. This dissertation is structured in five main chapters. First, a literature review focuses on theories and synthetic approaches that are relevant to the objectives of the study. In chapter 2, Ag NPs were prepared via the seed-mediated growth method. The effect of the pH on the yield was explored to increase the monodispersed yields of Ag NPs with various diameters. The plasmonic effect of Ag NPs diameters on inverted organic solar cell performance was explored. This study shows that the diameters of NPs can be controlled by altering the pH values. The performance of the subjected device increases with an increasing Ag NP diameter, yet the 70 nm Ag NPs yielded weaker performance. Chapter 3, Au NPs were synthesized via a high-temperature reduction method in an organic medium. This research study is the first attempt to coat Au NPs with HfO2 shell at two different shell thicknesses. The plasmonic peak shifted to longer wavelength according to the refractive index of HfO2. Additionally, the adverse effects of high-speed centrifugation on the stability and optical properties of NPs were studied. Chapter 4, HfO2@dye-SiO2 and Au@HfO2@dye-SiO2 MEF NPs were iii successfully obtained. Oregon Green-488 maleimide dye was functionalized and embedded in the SiO2 matrices. The emission enhancement and increasing in the Stokes shift of functionalized dye could ensure its suitability for laser-based applications. In conclusion, the design and tuning of the NPs will provide highly desirable NPs at high yields that would be suitable for use in electronic and optical devices at industrial scales. Also, some suggestions were proposed for future investigations that could provide improved results. Lasty, throughout my Ph.D's journey, my curiosity drove me to focus on NP synthesis. Therefore, the Appendix provides data obtained from the synthesis of NPs with different sizes and shapes.
URI for this recordhttp://hdl.handle.net/1974/28635
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