Diminished band-gap transitions of single-walled carbon nanotubes in complexation with aromatic molecules.
The 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.
Department of Chemistry, Howard L. Hunter Chemistry Laboratory, Clemson University, Clemson, SC 29634-0973, USA.
K A Shiral
KA
Fernando
Yi
Y
Lin
Wei
W
Wang
Satish
S
Kumar
Bing
B
Zhou
Su-Yuan
SY
Xie
LaShonda T
LT
Cureton
Ya-Ping
YP
Sun