Chirality-pure carbon nanotubes show distinct complexation with recognition DNA sequences

Pure-chirality single-wall carbon nanotubes (SWCNTs) that are non-covalently complexed with recognition DNA sequences exhibit unique interaction behavior and hybrid stability in aqueous environments. The complexation of DNA-wrapped SWCNTs was found to be a strong function of both the DNA sequence an...

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Bibliographic Details
Published in:Carbon (New York) 2020-10, Vol.167, p.601-608
Main Authors: Xhyliu, Fjorela, Ao, Geyou
Format: Article
Language:English
Subjects:
Aqueous environments
Aqueous solutions
Carbon
Chirality
Complexation
Deoxyribonucleic acid
DNA
Enantiomers
Fluorescence
Gene sequencing
Nanotubes
Near infrared radiation
Optical properties
Photoluminescence
Recognition
Single wall carbon nanotubes
Stability
Surfactants
Time constant
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Summary:Pure-chirality single-wall carbon nanotubes (SWCNTs) that are non-covalently complexed with recognition DNA sequences exhibit unique interaction behavior and hybrid stability in aqueous environments. The complexation of DNA-wrapped SWCNTs was found to be a strong function of both the DNA sequence and SWCNT chiral structure, highlighted by the distinct coating displacement of the same recognition DNA sequence from a pair of (6,5) enantiomers by a strong surfactant. A broad range of changes were observed for different DNA/SWCNT recognition pairs with surfactant exchange including the increase in nanotube photoluminescence intensity in the near-infrared (NIR) from 1.3 to 14.7-fold and time constants deduced from DNA displacement kinetics ranging from 9 s to 230 s. A large time constant of 230 s and a relatively small 4.4-fold increase in NIR emission intensity were obtained for the CTC3TC-(7,6) hybrid highlighting the vast potential of short DNA sequences for improved nanotube sorting and hybrid stability in aqueous environments. Additionally, CTC3TC-(7,6) was identified as the only hybrid to exhibit an increase in NIR fluorescence intensity in serum-containing cell culture media among all samples tested. Our results demonstrated unique optical properties and hybrid stability of DNA/SWCNT recognition pairs, providing a foundation for developing applications of chirality-pure SWCNTs. [Display omitted]
ISSN:0008-6223
1873-3891
DOI:10.1016/j.carbon.2020.06.040