Reversible surface oxidation and efficient luminescence quenching in semiconductor single-wall carbon nanotubes.
We have investigated reversible single-wall carbon nanotube (SWNT) oxidation by quantitative analysis of the oxide-induced absorption bleaching and luminescence quenching at low pH. These data, in combination with DFT structure calculations, suggest that the nanotube oxide is a 1,4-endoperoxide. At low pH, the endoperoxide protonates to create a hydroperoxide carbocation, introducing a hole in the SWNT valence band. Nanotube luminescence is extremely sensitive to quenching by hole-doping, while the absorption is relatively robust.
Dukovic
Gordana
G
Department of Chemistry, Columbia University, 3000 Broadway, New York, New York 10027, USA.
White
Brian E
BE
Zhou
Zhiyong
Z
Wang
Feng
F
Jockusch
Steffen
S
Steigerwald
Michael L
ML
Heinz
Tony F
TF
Friesner
Richard A
RA
Turro
Nicholas J
NJ
Brus
Louis E
LE