Journal
ANALYTICAL CHEMISTRY
Volume 77, Issue 19, Pages 6225-6228Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac0508954
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We report a size-exclusion chromatography (SEC) process to purify DNA-wrapped carbon nanotubes (DNA-CNT) and to sort them into fractions of uniform length. A type of silica-based column resin was identified that shows minimum adsorption of DNA-CNT. Three such columns in series with pore sizes of 2000, 1000, and 300 angstrom were found to separate DNA-CNT into fractions of very narrow length distribution, as measured directly by atomic force microscopy. The average length decreases monotonically from > 500 run in the early fractions to < 100 nm in the late fractions, with length variation <= 10% in each of the measured fractions. Using UV-vis-NIR spectroscopy, we showed that SEC is very effective in removing graphitic impurities that contribute to the spectral baseline and a broad absorption peak at similar to 270 nm. This result highlights the importance of CNT purification in the study of optical properties of CNT.
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