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Title: Synthesis and study of nanomaterials with tunable optical properties
Authors: XU HAIRUO
Keywords: Nanomaterials, shape control, phase control, optical properties, lifetime.
Issue Date: 12-Mar-2009
Citation: XU HAIRUO (2009-03-12). Synthesis and study of nanomaterials with tunable optical properties. ScholarBank@NUS Repository.
Abstract: The synthesis and optical properties of several nanomaterials, including doped ZnS, ZnO and CdS, were studied. In particular, synthesis methodology for ZnS, ZnS:Mn and ZnS:Mn/ZnS core/shell nanoparticles was developed. By varying the reaction rates and monomer concentration, the resultant nanoparticles could have rod- or spherical-shapes, and their crystal structures could be tuned from hexagonal wurtzite to cubic sphalerite. Their emission properties were studied using both steady-state and time-resolved photoluminescence. Decay lifetimes of the Mn2+ emission in both ZnS:Mn and ZnS:Mn/ZnS core/shell nanoparticles were determined. In the study of water-soluble CdS nanocrystals using a refluxing method, evidence to support the size-doubling hypothesis was provided using particle size estimation and growth kinetics calculation. The excited state dynamics of these two-sized particles were investigated. X-ray absorption fine structure study of Co- and Mn-doped ZnO nanoparticles was also carried out and the doping behaviors of Co and Mn were found to vary greatly.
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