Carbon nanotubes with covalently linked porphyrin antennae: photoinduced electron transfer.
Single- and multiwalled carbon nanotubes have been covalently functionalized with free-base porphyrin. The quantity of porphyrin linked to the surface was determined from thermogravimetric and UV-vis analysis. A reversible protonation equilibrium between the attached porphyrin and the residual acid groups of the carbon nanotubes has been identified. Steady-state fluorescence emission spectrum of the solutions of porphyrin-linked carbon nanotubes shows that the porphyrins act as energy absorbing and electron transferring antennae, and the carbon nanotubes act as efficient electron acceptors. The porphyrin-linked carbon nanotubes show 95-100% emission quenching, indicating a fast photoinduced electron transfer.
Baskaran
Durairaj
D
Department of Chemistry, University of Tennessee, 552 Buehler Hall, Knoxville, TN 37996, USA. baskaran@utk.edu
Mays
Jimmy W
JW
Zhang
X Peter
XP
Bratcher
Matthew S
MS