Abstract
Chiral selective reactivity and redox chemistry of carbon nanotubes are two emerging fields of nanoscience. These areas hold strong promise for producing methods for isolating nanotubes into pure samples of a single electronic type, and for reversible doping of nanotubes for electronics applications. Here, we study the selective reactivity of single-walled carbon nanotubes with organic acceptor molecules. We observe spectral bleaching of the nanotube electronic transitions consistent with an electron-transfer reaction occurring from the nanotubes to the organic acceptors. The reaction kinetics are found to have a strong chiral dependence, with rates being slowest for large-bandgap species and increasing for smaller-bandgap nanotubes. The chiral-dependent kinetics can be tuned to effectively freeze the reacted spectra at a fixed chiral distribution. Such tunable redox chemistry may be important for future applications in reversible non-covalent modification of nanotube electronic properties and in chiral selective separations.
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Acknowledgements
We thank Ming Zheng for sharing his results on K2IrCl6 oxidation of nanotubes before publication. M.O'C. acknowledges the support of the DCI postdoctoral fellowship program. This work was supported in part by the LANL LDRD program.
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O'Connell, M., Eibergen, E. & Doorn, S. Chiral selectivity in the charge-transfer bleaching of single-walled carbon-nanotube spectra. Nature Mater 4, 412–418 (2005). https://doi.org/10.1038/nmat1367
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DOI: https://doi.org/10.1038/nmat1367
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