Superconductor/carbon-nanotube junctions and interfaces Paola Barbara Georgetown University DMR 0239721

1
Superconductor/carbon-nanotube junctions and
interfaces Paola Barbara Georgetown University
DMR 0239721
The electrical characteristics of carbon nanotube
FETs (resistance vs. gate voltage VG) are very
sensitive to gas exposure.
Device fully exposed
Contacts covered with protection layer
Unexpected conclusion NO2 sensing is due to the
nanotube-electrode contacts!
We show that, in the case of exposure to NO2, the
response of the device is not due to molecules
adsorbed on the nanotube surface.
J. Zhang et al. , Appl. Phys. Lett. 88, 123112
(2006).
2
Superconductor/carbon-nanotube junctions and
interfaces Paola Barbara Georgetown University
DMR 0239721
VSD
I
Our carbon nanotube field effect transistors show
a very unusual resistance drop at low
temperature, along with a minimum of resistance
at zero bias. These features only occur in a
narrow range of gate voltage. One possible
explanation is that the nanotube becomes
superconducting and that superconductivity is
controlled by the electric field.
VG
carbon nanotube
J. Zhang et al. , Phys. Rev. B 74, 155414 (2006).
3
Superconductor/carbon-nanotube junctions and
interfaces Paola Barbara Georgetown University
DMR 0239721
A Century of Electronics From Vacuum Tubes to
Nanotubes.
The PI teaches a science class, The Way Things
Work, for undergraduate non-science majors (361
students in four years), where she introduced
lectures on electronics and nanoelectronics. She
also gave a popular lecture on the history of
electronics at the Osher Lifelong Learning
Institute at George Mason University. (This is
the first slide of that lecture.)