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

    Browse

    All of TUScholarShareCommunitiesDateAuthorsTitlesSubjectsGenresThis CollectionDateAuthorsTitlesSubjectsGenres

    My Account

    LoginRegister

    Help

    AboutPeoplePoliciesHelp for DepositorsData DepositFAQs

    Statistics

    Most Popular ItemsStatistics by CountryMost Popular Authors

    Fluorescence Labeling of Surface Species as an Efficient Tool for Detection, Identification and Quantification of Oxygen Containing Functionalities on Carbon Materials

    • CSV
    • RefMan
    • EndNote
    • BibTex
    • RefWorks
    Thumbnail
    Name:
    Dementev_temple_0225E_10599.pdf
    Size:
    7.336Mb
    Format:
    PDF
    Download
    Genre
    Thesis/Dissertation
    Date
    2011
    Author
    Dementev, Nikolay
    Advisor
    Borguet, Eric
    Committee member
    Strongin, Daniel R.
    Levis, Robert J.
    Gogotsi, IU. G., 1961-
    Department
    Chemistry
    Subject
    Chemistry, Physical
    Carbon Nanotubes
    Dynamic Oxidation
    Fluorescence
    Purification
    Solubilization
    Permanent link to this record
    http://hdl.handle.net/20.500.12613/1073
    
    Metadata
    Show full item record
    DOI
    http://dx.doi.org/10.34944/dspace/1055
    Abstract
    1. Fluorescence labeling and quantification of oxygen-containing functionalities on the surfaces of single walled and multi-walled carbon nanotubes. Nearly all applications of nanotubes (CNTs), from nanoelectronics to composites, require knowledge of the type and concentration of functionalities on the surface of the material. None of the methods conventionally used to characterize CNTs, such as Raman spectroscopy, IR spectroscopy, UV-VIS-NIR spectroscopy, and X-ray photoelectron spectroscopy, provide selectivity in identification together with sensitivity in quantification. Fluorescence labeling of surface species (FLOSS) to identify and quantify oxygen containing functionalities on single-walled carbon nanotubes (SWCNTs) and multiwalled carbon nanotubes (MWCNTs) provides a solution that is reported in this dissertation. The high selectivity of covalent attachment combined with the sensitivity of the fluorescence measurements, allowed us reliably determine concentrations of aldehyde (together with ketone), alcohol, and carboxylic functional groups on as-produced and acid treated SWCNTs. The detection limit is as low as ~ 0.5 % at (1 in every 200 carbon atoms).(You never established the lower limit clearly) 2. Purification of carbon nanotubes by dynamic oxidation in air. The outstanding mechanical and electronic properties of carbon nanotubes make them promising materials for use in different areas of nanotechnology. However, the presence of impurities in as-produced nanotubes has been a major obstacle toward their industrial scale applications. Amorphous and graphitic carbon, and catalytic metal particles are the major impurities in raw carbon nanotubes. Isothermal oxidation of as-produced carbon nanotubes, followed by acid treatment, is the most commonly used purification strategy. The thermal oxidation step eliminates carbonaceous impurities and the acid treatment decreases the metal content. Unfortunately, most of the existing oxidation procedures either do not destroy all carbonaceous impurities or partially destroy carbon nanotubes as well. In the dissertation, a novel purification protocol via dynamic oxidation of as-produced single-walled carbon nanotubes (SWCNT) is reported. In the new procedure, carbon nanotubes are exposed to a wide range of temperatures during the heating ramp. The results of the purification of arc-produced and laser vaporization grown SWCNT using dynamic oxidation are presented. Purity analysis of dynamically oxidized samples by UV-VIS-NIR and Raman spectroscopy, as well as transmission electron microscopy, explicitly demonstrate that dynamic oxidation enables obtaining undamaged carbon nanotubes almost free of carbonaceous impurities. 3. Surfactant- free method of solubilization of non-functionalized single-walled carbon nanotubes in common solvents. One of the major factors that hamper the extensive use of carbon nanotubes (CNTs) in large-scale applications are related to the poor purity of CNTs, and the weak dispersibility of CNTs in the most common solvents. The presence of substantial impurities (sometimes up to 80% wt.) in as-produced CNTs almost obliterates the unique properties of the material. Furthermore, the difficulties with solubilization of CNTs slow down the processability of the material in potential applications. A new one-step method of making pure single-walled carbon nanotubes (SWCNTs) via the sequence of sonication cycles is described in the dissertation. Hours long stable solutions of SWCNTs in acetone, methanol and isopropanol of concentrations as high as ~ 15 mg/L were prepared using the procedure. The results of UV-VIS-NIR, Raman and Transmission Electron Microscopy suggest that SWCNTs were not destroyed or damaged by purification and solubilization processes. A possible physico-chemical explanation of the solublization mechanism is discussed.
    ADA compliance
    For Americans with Disabilities Act (ADA) accommodation, including help with reading this content, please contact scholarshare@temple.edu
    Collections
    Theses and Dissertations

    entitlement

     
    DSpace software (copyright © 2002 - 2023)  DuraSpace
    Temple University Libraries | 1900 N. 13th Street | Philadelphia, PA 19122
    (215) 204-8212 | scholarshare@temple.edu
    Open Repository is a service operated by 
    Atmire NV
     

    Export search results

    The export option will allow you to export the current search results of the entered query to a file. Different formats are available for download. To export the items, click on the button corresponding with the preferred download format.

    By default, clicking on the export buttons will result in a download of the allowed maximum amount of items.

    To select a subset of the search results, click "Selective Export" button and make a selection of the items you want to export. The amount of items that can be exported at once is similarly restricted as the full export.

    After making a selection, click one of the export format buttons. The amount of items that will be exported is indicated in the bubble next to export format.