Electrical transport through single-wall carbon nanotube-anodic aluminum oxide-aluminum heterostructures.
Aluminum foils were anodized in sulfuric acid solution to form thick porous anodic aluminum oxide (AAO) films of thickness approximately 6 microm. Electrodes of carboxyl-functionalized single-wall carbon nanotube (SWCNT) thin films were inkjet printed on the anodic oxide layer and the electrical characteristics of the as-obtained SWCNT-AAO-Al structures were studied. Nonlinear current-voltage transport and strong temperature dependence of conduction through the structure was measured. The microstructure and chemical composition of the anodic oxide layer was analyzed using transmission and scanning electron microscopy as well as x-ray photoelectron spectroscopy. Schottky emission at the SWCNT-AAO and AAO-Al interfaces allowed by impurity states in the anodic aluminum oxide film together with ionic surface conduction on the pore walls of AAO gives a reasonable explanation for the measured electrical conduction. Calcined AAO is proposed as a dielectric material for SWCNT-field effect transistors.
Kukkola
Jarmo
J
Department of Electrical and Information Engineering, University of Oulu, Finland. jarmo.kukkola@ee.oulu.fi
Rautio
Aatto
A
Sala
Giovanni
G
Pino
Flavio
F
Tóth
Géza
G
Leino
Anne-Riikka
AR
Mäklin
Jani
J
Jantunen
Heli
H
Uusimäki
Antti
A
Kordás
Krisztián
K
Gracia
Eduardo
E
Terrones
Mauricio
M
Shchukarev
Andrey
A
Mikkola
Jyri-Pekka
JP