Chirality luminescent properties of single-walled carbon nanotubes during redox reactions

The optical measurement of single-walled carbon nanotubes (SWNTs) is a useful approach for understanding chirality characteristics because the excitation and emission wavelengths that produce maximum intensity are unique to SWNTs. properties SWNT in various biological applications envisaged be applicable nanobiosensors. Therefore, it necessary detect even small environmental changes, such as redox reactions, important identify optimal according applications. In this study, we focused on presence SWNTs with different chiralities within same powder, investigated correlation between rate change due reactions chirality. We measured chirality, which was difficult low intensity, by increasing exposure time during photoluminescence (PL) measurement. 0.5 mg powder 1 mL double-stranded DNA (dsDNA) stock solution were mixed sonicated using probe-type sonicator ice. supernatant prepared dsDNA-SWNT dispersion stored after centrifugation. Hydrogen peroxide (H2O2; final concentration: 0.03%) added oxidation, then, catechin aqueous (final concentration 1.5 μg/mL) measure PL. 90 s obtain sufficient intensity. results showed magnitude PL reaction each Focusing (8,6) (9,4) chiralities, large change, decreased 57.4% 54.6% from initial state, respectively, when H2O2 added. Subsequently, these values increased 1024% 558% addition solution, respectively. Furthermore, comparison detection response observed had strongest diameter.