• FAQ
    • Deposit your work
    • Login
    View Item 
    •   Rice Scholarship Home
    • Faculty & Staff Research
    • Faculty Publications
    • View Item
    •   Rice Scholarship Home
    • Faculty & Staff Research
    • Faculty Publications
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Structure-Dependent Thermal Defunctionalization of Single-Walled Carbon Nanotubes

    Thumbnail
    Name:
    Thermal defunct ms resubmitted ...
    Size:
    688.6Kb
    Format:
    PDF
    View/Open
    Author
    Ghosh, Saunab
    Wei, Fang
    Bachilo, Sergei M.
    Hauge, Robert H.
    Billups, W.E.
    Weisman, R. Bruce
    Date
    2015
    Citation
    Ghosh, Saunab, Wei, Fang, Bachilo, Sergei M., et al., . "Structure-Dependent Thermal Defunctionalization of Single-Walled Carbon Nanotubes." ACS Nano, (2015) http://dx.doi.org/10.1021/acsnano.5b01846.
    Published Version
    http://dx.doi.org/10.1021/acsnano.5b01846
    Abstract
    Covalent sidewall functionalization of single-walled carbon nanotubes (SWCNTs) is an important tool for tailoring their properties for research purposes and applications. In this study, SWCNT samples were first functionalized by reductive alkylation using metallic lithium and 1-iodododecane in liquid ammonia. Samples of the alkyl-functionalized SWCNTs were then pyrolyzed under an inert atmosphere at selected temperatures between 100 and 500 °C to remove the addends. The extent of defunctionalization was assessed using a combination of thermogravimetric analysis, Raman measurements of the D, G, and radial breathing bands, absorption spectroscopy of the first- and second-order van Hove peaks, and near-IR fluorescence spectroscopy of (n,m)-specific emission bands. These measurements all indicate a substantial dependence of defunctionalization rate on nanotube diameter, with larger diameter nanotubes showing more facile loss of addends. The effective activation energy for defunctionalization is estimated to be a factor of ∼1.44 greater for 0.76 nm diameter nanotubes as compared to those with 1.24 nm diameter. The experimental findings also reveal the quantitative variation with functionalization density of the Raman D/G intensity ratio and the relative near-IR fluorescence intensity. Pyrolyzed samples show spectroscopic properties that are equivalent to those of SWCNTs prior to functionalization. The strong structure dependence of the defunctionalization rate suggests an approach for scalable diameter sorting of mixed SWCNT samples.
    Keyword
    covalent functionalization; pyrolysis; dodecylation; D/G ratio; nanotube fluorescence restoration
    Type
    Journal article
    Citable link to this page
    http://hdl.handle.net/1911/80760
    Metadata
    Show full item record
    Collections
    • Chemistry Publications [403]
    • Faculty Publications [2827]

    Home | FAQ | Contact Us
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
     

     

    Browse

    Entire ArchiveCommunities & CollectionsBy Issue DateAuthorsTitlesSubjectsTypeThis CollectionBy Issue DateAuthorsTitlesSubjectsType

    My Account

    Login

    Statistics

    View Usage Statistics

    Home | FAQ | Contact Us
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892