Skip to content
University of Maryland LibrariesDigital Repository at the University of Maryland
    • Login
    View Item 
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    •   DRUM
    • Theses and Dissertations from UMD
    • UMD Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    STRUCTURE TAILORED PROPERTIES AND FUNCTIONALITIES OF ZERO-DIMENSIONAL NANOSTRUCTURES

    Thumbnail
    View/Open
    Tang_umd_0117E_10654.pdf (6.785Mb)
    No. of downloads: 1188

    Date
    2009
    Author
    Tang, Yun
    Advisor
    Ouyang, Min
    Metadata
    Show full item record
    Abstract
    The field of nanoscience and nanotechnology has achieved significant progress over last thirty years. Complex nanostructures with tunable properties for novel applications have been successfully fabricated and characterized. In this thesis, I will focus on our recent efforts on precise controlled synthesis of zero-dimensional nanostructures as well as fundamental understanding of the physical behavior of as-synthesized nanostructures. Particularly, three topics are presented: (1) Nanoscale crystallinity engineering: we have achieved nanoscale crystallinity control of noble metal nanoparticles with 100% yield by molecular engineering. We have used silver nanoparticles as example to demonstrate synthetic strategy and importance of such control in nanoscale chemical transformation, fundamental electron and phonon couplings and surface plasmon resonance based biological sensors. Such nanoscale crystallinity engineering provides a new pathway for design of complex nanostructures, tailoring nanoscale electronic and mechanical properties as well as controlling classical and quantum coupling interactions; (2) Precise control of core@shell nanostructures: we have developed a new universal strategy denoted as intermediated phase assisted phase exchange and reaction (iPAPER) to achieve layer-by-layer control of shell components in core@shell structures. Tunable plasmonic, optical and magnetic properties of core@shell structures enabled by our iPAPER strategy are further demonstrated. These characterizations are promising for understanding and manipulating nanoscale phenomena as well as assembling nanoscale devices with desirable functionality; and (3) Fundamental spin and structure manipulation of semiconductor quantum dots by hydrostatic pressure. Pressure provides a unique means of modifying materials properties. By measuring dependence of spin dynamics on pressure, we revealed that the spin states of semiconductor quantum dots are very robust. We further provided the first experimental evidence for the existence of a metastable intermediate state before the first-order phase transition of semiconductor quantum dots. Our results are crucial for the future development of quantum information processing based on spin qubits of quantum dots.
    URI
    http://hdl.handle.net/1903/9610
    Collections
    • Chemistry & Biochemistry Theses and Dissertations
    • Physics Theses and Dissertations
    • UMD Theses and Dissertations

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility
     

     

    Browse

    All of DRUMCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsThis CollectionBy Issue DateAuthorsTitlesSubjects

    My Account

    LoginRegister
    Pages
    About DRUMAbout Download Statistics

    DRUM is brought to you by the University of Maryland Libraries
    University of Maryland, College Park, MD 20742-7011 (301)314-1328.
    Please send us your comments.
    Web Accessibility