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Suppression of Metallic Conductivity of Single-Walled Carbon Nanotubes by Cycloaddition Reactions
- Kanungo, Mandakini, Lu, Helen, Malliaras, George G., Blanchet, Graciela B.
- Science 2009 v.323 no.5911 pp. 234-237
- alkenes, carbon nanotubes, cycloaddition reactions, electronic equipment, electronics
- 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.