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  • Title: Suppression of metallic conductivity of single-walled carbon nanotubes by cycloaddition reactions.
    Author: Kanungo M, Lu H, Malliaras GG, Blanchet GB.
    Journal: Science; 2009 Jan 09; 323(5911):234-7. PubMed ID: 19131624.
    Abstract:
    The high carrier mobility of films of semiconducting single-walled carbon nanotubes (SWNTs) is attractive for electronics applications, but the presence of metallic SWNTs leads to high off-currents in transistor applications. The method presented here, cycloaddition of fluorinated olefins, represents an effective approach toward converting the "as grown" commercial SWNT mats into high-mobility semiconducting tubes with high yield and without further need for carbon nanotube separation. Thin-film transistors, fabricated from percolating arrays of functionalized carbon nanotubes, exhibit mobilities >100 square centimeters per volt-second and on-off ratios of 100,000. This method should allow for the use of semiconducting carbon nanotubes in commercial electronic devices and provide a low-cost route to the fabrication of electronic inks.
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