Figure 1.

Characterization of SWNTs–dT₂₂ conjugates. (a) Photograph of the supernatant fraction obtained from the coupling steps with dT₂₂. (b) Denaturing PAGE image of (lane 1) dT₂₂ alone; (lane 2) purified SWNTs–dT₂₂ conjugates. (c) UV–Vis absorption spectra of SWNTs (black line) and SWNTs–dT₂₂ conjugates (red line); (d) SEM image of SWNTs–dT₂₂ conjugates. After the sample was purified as described in ‘Materials and Methods’ section, SEM shows that SWNTs are dispersed upon DNA conjugation. (e) AFM image of SWNTs–dT₂₂ conjugates. AFM indicates that dT₂₂ are conjugated to SWNTs and the formed conjugates are dispersed.