Research ArticleBIOENGINEERING

Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

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Science Advances  17 Feb 2021:
Vol. 7, no. 8, eabe0084
DOI: 10.1126/sciadv.abe0084
  • Fig. 1 Temperature tuning the selective adsorption of SWCNTs by chiral angle.

    (A) Schematic diagram of the separation of SWCNTs by chiral angle through temperature control. (B) Optical absorption spectra of the SWCNTs selectively adsorbed at various temperatures in the binary system of 0.5 wt % SC and 0.5 wt % SDS. a.u., arbitrary units. (C) Chirality map of the different chiral angle distributions of the SWCNTs selectively adsorbed at various temperatures.

  • Fig. 2 Separation of single-chirality zigzag and near-zigzag SWCNTs.

    (A) Schematic diagram of the experimental scheme for separating single-chirality zigzag and near-zigzag SWCNTs through successive separations by diameter and chiral angle. (B) Optical absorption spectra of the SWCNTs separated by diameter at different DOC concentrations with fixed 0.5 wt % SC and 1.0 wt % SDS. (C) Optical absorption spectra of the nanotubes separated by chiral angle in the second step. In each spectral pattern, the top spectrum corresponds to one of the first separated SWCNT fractions eluted at different DOC concentrations, and the lower spectra are the optical absorption spectra of the corresponding second separated single-chirality fractions.

  • Fig. 3 Characterization of the separated single-chirality species.

    (A) Optical absorption spectra of 15 types of single-chirality species separated by the temperature control technique. (B) Photographs of the separated single-chirality SWCNTs. (C) Purity distribution of various single-chirality (n, m) species. (D) Solution photographs of the submilligram-scale single-chirality near-zigzag species. The mass of each (n, m) SWCNT was calculated on the basis of its optical absorbance at 280 nm (60). Photo credit: Dehua Yang, Institute of Physics, Chinese Academy of Sciences.

  • Fig. 4 Temperature effect on the optical absorption spectra of the (6, 5) and (9, 1) SWCNTs.

    (A and B) S11 absorption peaks of (6, 5) and (9, 1) dispersed in 0.5 wt % SC and 0.5 wt % SDS at various temperatures. (C) Plots of redshift and relative absorbance of the S11 peaks of (9, 1) and (6, 5) SWCNTs as a function of temperature.

  • Fig. 5 Effect of the SDS/SC concentration ratio and temperature on the S11 peak shifts of (6, 5) and (9, 1) and the surfactant coating on them.

    (A) S11 peak shifts of (6, 5) and (9, 1) as a function of the concentration ratio of SC and SDS at various temperatures. Notably, the SDS concentration is varied with fixed 0.5 wt % SC in the left two panels; the SC concentration is varied with fixed 2 wt % SDS in the right two panels. (B) Schematic illustration of the surfactant coating structure change on an SWCNT when SDS molecules are introduced into SC dispersing SWCNTs. (C) Schematic illustration of the effect of the SDS/SC ratio on the surfactant coating change on SWCNTs. The colored regions correspond to the three stages in (A).

  • Fig. 6 Effect of the SDS and SC concentration ratio on the chirality distribution of the SWCNTs adsortbed at 12 °C and 18 °C.

    Relative content of different (n, m) species adsorbed onto gel at (A) 12° and (B) 18°C. The proportion of each (n, m) species was calculated as the ratio of the S11 peak area of (n, m) to the sum of the S11 peak areas.

Supplementary Materials

  • Supplementary Materials

    Submilligram-scale separation of near-zigzag single-chirality carbon nanotubes by temperature controlling a binary surfactant system

    Dehua Yang, Linhai Li, Xiaojun Wei, Yanchun Wang, Weiya Zhou, Hiromichi Kataura, Sishen Xie, Huaping Liu

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    • Figs. S1 to S16
    • Table S1

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