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Synthesis, Characterization and Property Investigations of CdS and ZnO Naonmaterials

Author: JiangJunYing
Tutor: HuangZaiYin
School: Guangxi University for Nationalities
Course: Applied Chemistry
Keywords: nanomaterials microemulsion hydrothermal CdS ZnO properties
CLC: TB383.1
Type: Master's thesis
Year: 2011
Downloads: 90
Quote: 0
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Abstract


CdS and ZnO are two of the most important semiconductor materials due to their applications in optoelectronics, catalyst, sensors, and so on. Lots of methods have been used to synthesize them. And liquid phase synthesis is seen as one of simple and efficient method, which has lower temperature, uncomplicated equipments, and controllable morphology of products.In this study, simple and facile solution-phase methods have been developed for the fabrication of CdS nanocrystals and ZnO nanomaterials. Influencing factors and growth mechanisms were also discussed.The main points as follows:1. A simple and facile solution-phase method has been developed for the fabrication and growth thermodynamic studies of CdS nanocrystals (NCs) using isothermal titration calorimetry (ITC). Monodispersed and uniform CdS NCs with diameter less than 10 nm have been successfully obtained by controlling the preparation conditions. Meanwhile, the growth thermodynamic properties were observed in situ using ITC. Studying on the thermodynamics of nanomaterials makes significant advances in our understanding of its growth mechanism, as well as the correlation between thermodynamic data and structure. Optimization process of synthesizing target nanomaterials can also be realized.2. Three novel microemulsion-mediated hydrothermal routes have been successfully used to synthesize ZnO nanomaterials with various morphologies, such as nanowires, nanosheets, nanorods, naontubes, nanotetrapods and nanogrenades. All kinds of influencing factors like the value ofω, the temperature of hydrothermal process, the concentrations of reactants, time and methods control the structure and properties of products.3. The morphologies and structures of typical ZnO nanomaterials were discussed, and the formation mechanisms were shown. 4. Photoluminescence, electrochemical and thermodynamic analysis were employed to study their properties.

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