Abstract
It has been reported that even if single-walled carbon nanotubes (SWNTs) are coated with the same polymer, the redox characteristics change of each chirality may differ. Particularly, the addition of hydrogen peroxide (H2O2) minimally affects the near-infrared (NIR) absorption spectra of the dsDNA-(6,5)-enriched SWNT complex (DNA-SWNT complex). Detecting the redox properties of (6,5) chirality using NIR absorption spectra has been one of the issues to be solved. We hypothesized that an oxidizing agent with high oxidizing power is required to detect the absorption spectra of (6,5) chirality. In this study, we used KMnO4, which contains atoms with a high oxidation number. A dispersion was prepared by mixing 0.5 mg of (6,5)-enriched SWNT powder with 1 mg/mL of DNA solution. After adding H2O2 or KMnO4 to this dispersion and oxidizing it, catechin solutions were added to reduce the dispersion. The absorption peak of the DNA-SWNT complex decreased by 23.9% following the addition of KMnO4 (final concentration: 0.5 µM) and recovered 30.7% following the addition of the catechin solution. We revealed that the changes in the absorption spectra change of (6,5) chirality, which could not be detected by H2O2, can be detected by using KMnO4. We also varied the concentration of KMnO4 and verified whether the adsorption of KMnO4 can be modeled as a Langmuir adsorption isotherm.
Highlights
Single-walled nanotubes (SWNTs) can be synthesized by using different methods
We revealed that the changes in the absorption spectra change of
Common methods include the chemical vapor deposition (CVD) method, in which a carbon-based gas is blown into a heating furnace with a carrier gas to synthesize SWNTs [1,2,3,4]; the arc discharge method, in which
Summary
Single-walled nanotubes (SWNTs) can be synthesized by using different methods. Common methods include the chemical vapor deposition (CVD) method, in which a carbon-based gas is blown into a heating furnace with a carrier gas to synthesize SWNTs [1,2,3,4]; the arc discharge method, in which. A direct correlation between the bandgap of semiconductor nanotubes and their reduction potential was identified In their study, they showed that (6,5)-enriched SWNTs can be oxidized by adding potassium (IV) chloroiridate (K2 IrCl6 ) as an oxidant; they found that changes in concentration affected the absorption spectra [22]. They showed that (6,5)-enriched SWNTs can be oxidized by adding potassium (IV) chloroiridate (K2 IrCl6 ) as an oxidant; they found that changes in concentration affected the absorption spectra [22] They did not report on the KMnO4 -induced redox action of SWNTs. Our group has previously investigated the (9,4) and (8,7) chirality of SWNTs; we determined the redox characteristics of SWNTs by applying NIR and PL in order to reveal the optical response of SWNTs to H2 O2 and catechin [23,24]. We show that the oxidation state of the (6,5) chirality can be determined by using KMnO4 and analyzing the absorption spectra
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