Toward single-chirality carbon nanotube device arrays.
The large-scale integration of devices consisting of individual single-walled carbon nanotubes (SWCNT), all of the same chirality, is a critical step toward their electronic, optoelectronic, and electromechanical application. Here, the authors realize two related goals, the first of which is the fabrication of high-density, single-chirality SWCNT device arrays by dielectrophoretic assembly from monodisperse SWCNT solution obtained by polymer-mediated sorting. Such arrays are ideal for correlating measurements using various techniques across multiple identical devices, which is the second goal. The arrays are characterized by voltage-contrast scanning electron microscopy, electron transport, photoluminescence (PL), and Raman spectroscopy and show identical signatures as expected for single-chirality SWCNTs. In the assembled nanotubes, a large D peak in Raman spectra, a large dark-exciton peak in PL spectra as well as lowered conductance and slow switching in electron transport are all shown to be correlated to each other. By comparison to control samples, we conclude that these are the result of scattering from electronic and not structural defects resulting from the polymer wrapping, similar to what has been predicted for DNA wrapping.
Vijayaraghavan
Aravind
A
Institut fur Nanotechnologie, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany. aravind.vijayaraghavan@kit.edu
Hennrich
Frank
F
Stürzl
Ninette
N
Engel
Michael
M
Ganzhorn
Marc
M
Oron-Carl
Matti
M
Marquardt
Christoph W
CW
Dehm
Simone
S
Lebedkin
Sergei
S
Kappes
Manfred M
MM
Krupke
Ralph
R