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    Single-Source Precursors for the Synthesis of Layered Metal Chalcogenide Nanomaterials: LnX2, CuCrX2, and Bi2X3

    Cover for Single-Source Precursors for the Synthesis of  Layered Metal Chalcogenide Nanomaterials:  LnX2, CuCrX2, and Bi2X3
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    View/Open: Atif_georgetown_0076D_15019.pdf (39.MB) Bookview

    Creator
    Atif, Rida
    Advisor
    Stoll, Sarah L
    Abstract
    Layered materials belong to a class of compounds in which individual, 2-dimensional units are stacked upon each other and held together by weak intermolecular forces. The layered nature of these materials render them ideal for techniques like intercalation, exfoliation, alloying, among others in order to tune their properties. Here, single-source precursors (SSP) from the lanthanides, transition metals, and main group metals will be synthesized and utilized to yield different classes of layered compounds: LnX2, CuCrX2, and Bi2X3, respectively. First, we describe the synthesis of a series of novel lanthanide SSPs, [Ln(Se2PPh2)3(MeCN)x], which were thermolyzed to yield LnSe2-x, an understudied class of 2D layered materials. In a group known for work with rare earth materials, particularly EuS, it was exciting to have discovered a mild route to other lanthanide chalcogenide materials. We explore the synthetic versatility of these precursors through synthesizing alloys of LnSe2-x as well understanding the growth mechanisms in order to yield single- or few- layered sheets. Next, we describe the synthesis of layered ternary transition metal chalcogenides, CuCrX2 and CuCr2X4 which form as hexagonal nanoplates. We utilized SSPs of Cr(III) and Cu(I)/(II) to understand the role of oxidation state, as well as precursor ratio and reaction temperatures, in order to gain phase control and avoid secondary phases. Lastly, we briefly discuss SSPs for synthesizing layered main group chalcogenide nanomaterials, Bi2X3. Bismuth based materials are in interesting comparison to lanthanides due to their similarity in size and charge but lack of f-block valence electrons. Here, we demonstrate the clear advantage of utilizing a SSP through affording defect-free phase-pure material as clear hexagonal nanoplates (compared to separate Bi(III) and Se reagents).
    Description
    Ph.D.
    Permanent Link
    http://hdl.handle.net/10822/1062643
    Date Published
    2021
    Subject
    2D materials; Layered materials; Nanoplates; Nanosheets; Single Source Precursors; Materials science; Nanoscience; Chemistry; Materials Science; Nanoscience; Chemistry;
    Type
    thesis
    Publisher
    Georgetown University
    Extent
    136 leaves
    Collections
    • Graduate Theses and Dissertations - Chemistry
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    Georgetown University Seal
    ©2009 - 2022 Georgetown University Library
    37th & O Streets NW
    Washington DC 20057-1174
    202.687.7385
    digitalscholarship@georgetown.edu
    Accessibility