This thesis addresses various aspects of nanoparticles which attract considerable scientific interest.
In chapter 2 and 3, photoionization of individual nanocrystals (CdSe/CdS and CdSe/CdS/ZnS) has been studied by Electric Force Microscopy (EFM). A different response have been observed for two types of high-quality NCs. The magnitude of the charge due to photoionization was found to be wavelength dependent which implies a "hot-electron" process.
A new metastable phase of vanadium dioxide hydrate with one-dimensional nanostructure has been synthesized through hydrothermal recrystallization which is described in chapter 4. We propose a hydrating-exfoliating-splitting mechanism to elucidate the formation of nanowires and nanoribbons.
Finally, we have conducted synthesis of HfO2 nanoparticles with different crystallinity and morphology. Among them, the amorphous form of HfO2 nanoparticles shows a high solubility in organic solvent which makes it a possible material for high refractive index fluid used in photolithography industry. There is a restriction due to the absorption at the UV region of spectrum. All the details are talked about in chapter 5 and chapter 6.
|School Location:||United States -- New York|
|Source:||DAI-B 70/12, Dissertation Abstracts International|
|Keywords:||Hafnium oxide, Metal oxide nanoparticles, Nanocrystals, Photoionization, Vanadium dioxide|
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