Diminished Band-Gap Transitions of Single-Walled Carbon Nanotubes in Complexation with Aromatic Molecules

通讯作者地址: Sun, YP (通讯作者), Clemson Univ, Howard L Hunter Chem Lab, Dept Chem, Clemson, SC 29634 USA 地址: 1. Clemson Univ, Howard L Hunter Chem Lab, Dept Chem, Clemson, SC 29634 USAThe near-IR absorption spectrum of semiconducting single-walled carbon nanotubes is characterized by the transitions associated with the first (S11) and second (S22) pairs of van Hove singularities in the electronic density of states. We report that a significant effect on the transitions can be caused by non-covalent complexation of the nanotube with planar aromatic molecules such as pyrenes in solution, resulting in the absence of S11 and S22 bands in the near-IR absorption spectrum. Since the complexation is reversible, the characteristic absorption bands can be turned on and off with the complexation in a reversible fashion