Title page for ETD etd-12072005-112723

Type of Document Dissertation
Author Xu, Yang
URN etd-12072005-112723
Title Synthesis and Characterization of Silica Coated CdSe/CdS Core/Shell Quantum Dots
Degree PhD
Department Electrical and Computer Engineering
Advisory Committee
Advisor Name Title
Meehan, Kathleen Committee Chair
Guido, Louis J. Committee Member
Love, Nancy C. Committee Member
Lu, Guo-Quan Committee Member
Wyatt, Christopher L. Committee Member
  • CdS
  • Silica
  • semiconductor nanocrystal
  • quantum dots
  • CdSe
Date of Defense 2005-12-02
Availability unrestricted
A great deal of interest has been dawn on the colloidal chemistry based semiconductor nanocrysallites, also known as quantum dots (QDs). Because of the strong quantum confinement, quantum dots have unique size-dependent optical properties, which are much more superior to the conventional organic fluorescence materials. In addition, strong chemical resistant makes inorganic semiconductor QDs ideal candidate for next-generation of bio-labels and drug delivery vehicles. This report presents a user friendly approach to synthesize high quality biocompatible CdSe QDs in aqueous solution. Size of the dots can be controlled by adjusting the temperature, pH of the solution, and ratio of the precursors. A thin CdS layer was grown on CdSe QDs, forming a CdSe/CdS core/shell structure, to improve the photoluminescence. In order to use these QDs in-vivo, a more chemically robust coating, silica, was grown on the core/shell structure QD. The optical properties of the QDs were characterized by absorption and photoluminescence spectra. X-ray diffraction and transmission electron microscopy were conducted to verify the QDs composition and structure.
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