The electron transfer (ET) rate constants driving the V OC generation are shown to vary with the chirality-associated Marcus theory, suggesting that the energy gaps between SWNT and the LUMO of acceptor molecules dictate the ET process. A considerable enhancement in the observed V OC, from 80 to 440 mV, is observed for SWNT/molecule acceptor pairs that have molecular volume below 120 Å 3 and lowest unoccupied molecular orbital (LUMO) energies centered around −0.8 eV.
We explore 27 small, organic, electron-acceptor molecules that are shown to tune the output open-circuit voltage ( V OC) across three types of pristine SWNT papers with varying ( n, m) chirality distributions. The concept of electrical energy generation based on asymmetric chemical doping of single-walled carbon nanotube (SWNT) papers is presented.
