Visualizing the local optical response of semiconducting carbon nanotubes to DNA-wrapping.
We studied the local optical response of semiconducting single-walled carbon nanotubes to wrapping by DNA segments using high resolution tip-enhanced near-field microscopy. Photoluminescence (PL) near-field images of single nanotubes reveal large DNA-wrapping-induced red shifts of the exciton energy that are two times higher than indicated by spatially averaging confocal microscopy. Near-field PL spectra taken along nanotubes feature two distinct PL bands resulting from DNA-wrapped and unwrapped nanotube segments. The transition between the two energy levels occurs on a length scale smaller than our spatial resolution of about 15 nm.
Qian
Huihong
H
Department Chemie and Biochemie and CeNS, Ludwig-Maximilians-Universitat Munchen, 81377 Munchen, Germany.
Araujo
Paulo T
PT
Georgi
Carsten
C
Gokus
Tobias
T
Hartmann
Nicolai
N
Green
Alexander A
AA
Jorio
Ado
A
Hersam
Mark C
MC
Novotny
Lukas
L
Hartschuh
Achim
A
D004247:DNA / Q000737:chemistry*; D037742:Nanotubes, Carbon; D012666:Semiconductors
D037742:Nanotubes, Carbon; D004247:DNA