Enhanced
Tunneling in a Hybrid of Single-Walled Carbon
Nanotubes and Graphene
Version 2 2019-09-19, 20:14
Version 1 2019-09-18, 21:13
Posted on 2019-09-19 - 20:14
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and conductive films (TCFs) are of great technological
importance. Their high transmittance, electrical conductivity, and
mechanical strength make single-walled carbon nanotubes (SWCNTs) a
good candidate for the raw material for TCFs. Despite the ballistic
transport in individual SWCNTs, electrical conductivity of SWCNT networks
is limited by low efficiency of charge tunneling between the tube
elements. Here, we demonstrate that the nanotube network sheet resistance
at high optical transmittance is decreased by more than 50% when fabricated
on graphene. This is a comparable improvement as that
obtained through gold chloride (AuCl3) doping. However,
while Raman spectroscopy reveals substantial changes in spectral features of
AuCl3 doped nanotubes, this does not occur with graphene.
Instead, temperature-dependent transport measurements indicate that
a graphene substrate reduces the tunneling barrier heights, while
its parallel conductivity contribution is almost negligible. Finally,
we show that combining the graphene substrate and AuCl3 doping, brings the SWCNT thin film sheet resistance down
to 36 Ω/□.
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Liao, Yongping; Mustonen, Kimmo; Tulić, Semir; Skákalová, Viera; Khan, Sabbir A.; Laiho, Patrik; et al. (2019). Enhanced
Tunneling in a Hybrid of Single-Walled Carbon
Nanotubes and Graphene. ACS Publications. Collection. https://doi.org/10.1021/acsnano.9b05049
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AUTHORS (12)
YL
Yongping Liao
KM
Kimmo Mustonen
ST
Semir Tulić
VS
Viera Skákalová
SK
Sabbir A. Khan
PL
Patrik Laiho
QZ
Qiang Zhang
CL
Changfeng Li
MM
Mohammad R. A. Monazam
JK
Jani Kotakoski
HL
Harri Lipsanen
EK
Esko I. Kauppinen