Abstract
Semiconductor single-walled carbon nanotubes (SWNTs) have unique characteristics owing to differences in the three-dimensional structure (chirality) expressed by the chiral index (n,m), and many studies on the redox characteristics of chirality have been reported. In this study, we investigated the relationship between the chirality of SWNTs and the oxidizing power of oxidants by measuring the near-infrared (NIR) absorption spectra of two double-stranded DNA-SWNT complexes with the addition of three oxidants with different oxidizing powers. A dispersion was prepared by mixing 0.5 mg of SWNT powder with 1 mg/mL of DNA solution. Different concentrations of hydrogen peroxide (H2O2), potassium hexachloroidylate (IV) (K2IrCl6), or potassium permanganate (KMnO4) were added to the dispersion to induce oxidation. Thereafter, a catechin solution was added to observe if the absorbance of the oxidized dispersion was restored by the reducing action of the catechin. We found that the difference in the oxidizing power had a significant effect on the detection sensitivity of the chiralities of the SWNTs. Furthermore, we revealed a detectable range of oxidants with different oxidizing powers for each chirality.
Highlights
Single-walled carbon nanotubes (SWNTs) are versatile nanomaterials with many notable electronic and mechanical properties
To separate the single-walled carbon nanotubes (SWNTs) bundles, SWNT powder has been mixed with doublestranded DNA and sonicated under appropriate conditions to form a dsDNASWNT complex in which the dsDNA molecules wrapped the SWNT surface [1,2,3,4,5,6,7,8,9]
We focused on the detection sensitivity of the chirality of SWNTs and oxidizing powers of oxidants, measured the absorption spectra using oxidants with different oxidizing powers, and investigated the effect of the difference in oxidizing power on the chirality
Summary
Single-walled carbon nanotubes (SWNTs) are versatile nanomaterials with many notable electronic and mechanical properties. They are expected to be integral to the realization of a low-carbon society. To separate the SWNT bundles, SWNT powder has been mixed with doublestranded DNA (dsDNA) and sonicated under appropriate conditions to form a dsDNASWNT complex in which the dsDNA molecules wrapped the SWNT surface [1,2,3,4,5,6,7,8,9]. SWNTs have a structure in which a graphene sheet is rolled into a cylindrical shape, and they typically have a diameter of few nanometers. To form a seamless cylindrical tube, it is necessary to take two of the hexagons in a graphene lattice and overlap them
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
