• Login
    View Item 
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    •   SMARTech Home
    • Georgia Tech Theses and Dissertations
    • Georgia Tech Theses and Dissertations
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Bimetallic nanocrystals for applications in plasmonics and catalysis

    Thumbnail
    View/Open
    SUN-DISSERTATION-2017.pdf (14.12Mb)
    Copyright Chapter 4 Gold box-ACS nano.pdf (130.5Kb)
    Copyright Chapter 3 Role of pH.pdf (130.1Kb)
    Copyright Chapter 2 Dual catalyst.pdf (182.9Kb)
    Copyright Chapter 2 Bimetallic nanoframe.pdf (182.4Kb)
    Copyright Cgapter 1 and 7 ACR review.pdf (129.3Kb)
    Copyright Chapter 3 Ref 21.pdf (130.2Kb)
    Copyright Chapter 3 Ref 20.pdf (185.6Kb)
    Copyright Chapter 1 Ref 126.pdf (130.2Kb)
    Copyright Chapter 1 Ref 102.pdf (129.8Kb)
    Copyright Chapter 1 Ref 34-3 figure.pdf (129.4Kb)
    Copyright Chapter 1 Ref 31.pdf (184.8Kb)
    Date
    2017-11-08
    Author
    Sun, Xiaojun
    Metadata
    Show full item record
    Abstract
    Bimetallic nanocrystals have received growing interest owing to their diversified properties and promising applications. Seeded growth serves as a powerful route to bimetallic nanocrystals but its capability is limited by galvanic replacement reaction when the seed is more reactive than the deposited metal. This dissertation documents two strategies for achieving galvanic replacement-free seeded growth of a second metal (M: Au, Pd, or Pt) on Ag nanocrystals. The first strategy relies on the co-titration of AgNO3 and a precursor to M for the generation of Ag and M atoms via co-reduction, followed by the co-deposition on Ag nanocubes for the generation of Ag@Ag-M core-frame nanocubes. The resultant Ag@Ag-Au core-frame nanocubes exhibit enhanced surface-enhanced Raman scattering (SERS) activity at an excitation wavelength of 785 nm. On the other hand, the Ag@Ag-Pd nanocubes can play as a dual catalyst for probing stepwise catalytic reduction and oxidation reactions by SERS. The second strategy involves the use of hydroxide to transform Ag nanocubes into Ag@Au and Ag@Pt core-shell nanocubes under an alkaline condition. Upon the removal of Ag cores, the Ag@Au core-shell nanocubes can be converted into Au nanoboxes with wall thickness less than 2 nm and well-defined openings at corners. These nanoboxes embrace strong absorption in the near-infrared region for potential biomedical applications. In comparison, the Ag@Pt nanocubes can be transformed into Pt-based nanocages. These nanocages exhibit improved catalytic activity toward the oxygen reduction reaction (ORR). Collectively, this work greatly expands the utility of seeded growth for the rational design and synthesis of bimetallic nanocrystals with well-defined structures and desired properties.
    URI
    http://hdl.handle.net/1853/59250
    Collections
    • Georgia Tech Theses and Dissertations [23877]
    • School of Materials Science and Engineering Theses and Dissertations [986]

    Browse

    All of SMARTechCommunities & CollectionsDatesAuthorsTitlesSubjectsTypesThis CollectionDatesAuthorsTitlesSubjectsTypes

    My SMARTech

    Login

    Statistics

    View Usage StatisticsView Google Analytics Statistics
    facebook instagram twitter youtube
    • My Account
    • Contact us
    • Directory
    • Campus Map
    • Support/Give
    • Library Accessibility
      • About SMARTech
      • SMARTech Terms of Use
    Georgia Tech Library266 4th Street NW, Atlanta, GA 30332
    404.894.4500
    • Emergency Information
    • Legal and Privacy Information
    • Human Trafficking Notice
    • Accessibility
    • Accountability
    • Accreditation
    • Employment
    © 2020 Georgia Institute of Technology