Functionalization of vertically aligned carbon nanotubes with polystyrene via surface initiated reversible addition fragmentation chain transfer polymerization

Thomas Macdonald, Christopher Gibson, Kristina Constantopoulos, Joseph Shapter, Amanda Ellis

    Research output: Contribution to journalArticle

    15 Citations (Scopus)

    Abstract

    Here we demonstrate the covalent attachment of vertically aligned (VA) acid treated single-walled carbon nanotubes (SWCNTs) onto a silicon substrate via dicyclohexylcarbodiimide (DCC) coupling chemistry. Subsequently, the pendant carboxyl moieties on the sidewalls of the VA-SWCNTs were derivatized to acyl chlorides, and then finally to bis(dithioester) moieties using a magnesium chloride dithiobenzoate salt. The bis(dithioester) moieties were then successfully shown to act as a chain transfer agent (CTA) in the reversible addition fragmentation chain transfer (RAFT) polymerization of styrene in a surface initiated "grafting-from" process from the VA-SWCNT surface. Atomic force microscopy (AFM) verified vertical alignment of the SWCNTs and the maintenance thereof throughout the synthesis process. Finally, Raman scattering spectroscopy and AFM confirmed polystyrene functionalization.

    Original languageEnglish
    Pages (from-to)2836-2843
    Number of pages8
    JournalApplied Surface Science
    Volume258
    Issue number7
    DOIs
    Publication statusPublished - 15 Jan 2012

    Keywords

    • Bis(dithioester)
    • Polystyrene
    • Reversible addition fragmentation chain transfer (RAFT)
    • Vertically aligned carbon nanotubes

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