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    Organometallic Synthesis Kinetics of CdSe Quantum Dots

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    Ch0aTitle.pdf (24.35Kb)
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    Ch0bTOC.pdf (73.14Kb)
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    Ch1Applications.pdf (65.60Kb)
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    Ch2Theory.pdf (65.41Kb)
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    Ch3History.pdf (223.9Kb)
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    Ch4Hypothesis.pdf (242.4Kb)
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    Ch5Experimental.pdf (482.2Kb)
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    Ch6Results.pdf (435.9Kb)
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    Ch7Discussion.pdf (127.8Kb)
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    Ch8Refs.pdf (108.1Kb)
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    Ch9Appendix.pdf (412.9Kb)
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    Ch10Vita.pdf (30.59Kb)
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    Date
    2005-04-12
    Author
    Dickerson, Bryan Douglas
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    Abstract
    CdSe quantum dots produced by organometallic synthesis are useful as tunable emitters for photonic devices and as multi-colored protein markers for biomedical imaging, applications requiring bright and narrow emission. A diffusion-limited model helped monitor growth rates via photoluminescence and absorbance spectroscopy, in order to characterize synthesis kinetics in stearic acid, dodecylamine, and in trioctylphosphine oxide. The nucleation rate increased with Se concentration, while the growth rate followed the Cd concentration. Emission peak widths, emission redshift rates, nanocrystal growth rates, and reactant concentrations all decreased to a minimum when emission reached the critical wavelength, at a reaction completion time, tc. The temperature dependence of 1/tc and of redshift rates followed Arrhenius behavior governed by activation energies, which were tailored by the choice of solvent. Synthesis in solvents, such as stearic acid, with lower activation energies produced faster initial nanocrystal growth and longer critical wavelengths. The highest photoluminescence quantum yield was generally at wavelengths shorter than the critical wavelength, when moderate growth rates enabled surface reconstruction while precursors were still available.
    URI
    http://hdl.handle.net/10919/27322
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    • Doctoral Dissertations [14868]

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