'Seed' molecules have been made that enable synthesis of just one kind of single-walled carbon nanotube, rather than a mixture of species. This paves the way for the preparation of pure samples of any nanotube species. See Letter p.61
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Tour, J. Seeds of selective nanotube growth. Nature 512, 30–31 (2014). https://doi.org/10.1038/512030a
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DOI: https://doi.org/10.1038/512030a
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