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Carbon single-walled nanotubes (SWNTs) need to be highly pure for use in various applications. A simple and efficient purification method is reported here to provide >98 % pure SWNTs (see Figure) in a three-step process involving dilute nitric acid reflux and oxidation in air. The method also provides an analytical technique for the determination of the SWNT content in the crude and purified samples.
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Dillon et al. (1999) studied this question.
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