Single Molecule Optical Studies of DNA-Nanotube Hybrids Isolated by Sequence Dependent DNA Assembly

In this work, optical studies are carried out simultaneously using both fluorescence and resonance Raman scattering techniques on isolated DNA-nanotube hybrids that are prepared by the sequence dependent wrapping of single stranded DNA, around CoMoCAT nanotubes (NT) (d_t sim 0.75nm). The optical measurements are carried out on the same NT after the DNA is removed. The study at the single nanotube level gives insights into how the charge transfer between biomolecules and the NT alters the electronic structure. At the same time, the two complementary optical techniques provide a good assessment of the tight binding approximation (TBA) for the interband transition energy, E_ii, in the small diameter regime.