Chiral selectivity in the charge-transfer bleaching of single-walled carbon-nanotube spectra

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.

Interaction of solid organic acids with carbon nanotube field effect transistors

“…The effect is most likely due to protonation, followed by oxidation to radical cation in the presence of oxygen [12,20]. The presence of oxygen seems to be necessary for the stabilization of the protonation, since we find that the doping effect vanishes in vacuum and can be restored by exposure to air.…”

Carbon Nanotubes for Electronic and Electrochemical Detection of Biomolecules

“…[56,59] Charge-transfer or environmentally induced doping progressively red-shifts and quenches the photoluminescence of sem-SWNTs. [80] Rayleigh scattering, [81] transmission electron microscopy, and electron diffraction [82][83][84] have been also used for (n, m)-characterization of individualized SWNTs, suspended over a trench to remove interference from the substrate. Scanning-probe microscopy has played a key role for determining CNT length, diameter of nanotube bundles, and features of aggregate organization along with CNT association with biological and nanostructured materials.…”

Raman bands of double‐wall carbon nanotubes: comparison with single‐ and triple‐wall carbon nanotubes, and influence of annealing and electron irradiation

“…22 The second-order spectrum of the D band, G 0 2D , has been used to probe the effects of the environment on SWCNTs. 23,24 It has been suggested that the two features contributing to the D band are due to the inner and outer tubes, 25 leading, consequently, to a splitting of the G 0 2D band. Its temperature and pressure dependence are useful to extract information on the influence of the tube environment.…”