• About
    • Login
    View Item 
    •   Institutional Repository Home
    • Electronic Theses and Dissertations
    • Electronic Theses and Dissertations
    • View Item
    •   Institutional Repository Home
    • Electronic Theses and Dissertations
    • Electronic Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Browse

    All of Institutional RepositoryCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsDepartmentThis CollectionBy Issue DateAuthorsTitlesSubjectsDepartment

    My Account

    LoginRegister

    Phase Controlled Synthesis of Iron Sulfide Nanocrystals

    Rhodes, Jordan Marcus
    0000-0003-4853-9243
    : http://hdl.handle.net/1803/10097
    : 2020-04-03

    Abstract

    The iron sulfides are the most earth abundant naturally occurring metal sulfides with a wide range of properties and thereby applications. However, relative to other metal chalcogenides, the iron-sulfur system is poorly understood due to its complexity, as numerous phase variations arise from minimal changes in stoichiometry. This thesis demonstrates that organosulfur precursor reactivity tunes the phase of iron sulfide nanocrystals phase between pyrite (FeS2), greigite (Fe3S4), and pyrrhotite (Fe1-XS) in a colloidal hot injection synthesis. Sulfur rich phases were favored when the C-S bond strength was low in the dialkyl disulfides, alkyl thiols, and dialkyl disulfides (allyl, benzyl, t-butyl, and phenyl). Diallyl disulfide alone yielded FeS2, which is noteworthy as a potential source of (S-S) 2- units. Evidence is provided that suggests that FeS2 forms directly without an FeS intermediate, unlike most synthetic procedures to pyrite. FeS2 is of particular interest as a low-cost earth abundant semiconductor for photovoltaics. In addition to phase control, a novel pyrite hybrid nanostructure was synthesized in which an epitaxial layer of isostructural cattierite (CoS2) was grown on the surface of FeS2 nanocubes. The epitaxial layer morphology was tuned between core-frame and core-shell structures based on the cobalt/sulfur precursor ratio and the hybrid nanocrystals demonstrated activity toward the hydrogen evolution reaction (HER). Approved
    Show full item record

    Files in this item

    Thumbnail
    Name:
    RHODES-DISSERTATION-2020.pdf
    Size:
    8.346Mb
    Format:
    PDF
    View/Open

    This item appears in the following collection(s):

    • Electronic Theses and Dissertations

    Connect with Vanderbilt Libraries

    Your Vanderbilt

    • Alumni
    • Current Students
    • Faculty & Staff
    • International Students
    • Media
    • Parents & Family
    • Prospective Students
    • Researchers
    • Sports Fans
    • Visitors & Neighbors

    Support the Jean and Alexander Heard Libraries

    Support the Library...Give Now

    Gifts to the Libraries support the learning and research needs of the entire Vanderbilt community. Learn more about giving to the Libraries.

    Become a Friend of the Libraries

    Quick Links

    • Hours
    • About
    • Employment
    • Staff Directory
    • Accessibility Services
    • Contact
    • Vanderbilt Home
    • Privacy Policy