Our first nanotube device was a SET made of an arc-discharge-grown MWNT
using AFM manipulation (material from P. Bernier, University of
Montpellier).
In this device, we saw single electron charging effects via gate
modulation. The results imply this MWNT to be semiconducting with a gap of
15 meV. The observed Coulomb staircase structure agrees with asymmetry of
the tunnel junctions. The Coulomb energy of the island was 23 K.
Figure on the right displays the first MWNT SET made by moving an
arc-discharge-grown tube on top of prefabricated gold leads: the left end is
on top of the lead while the right end touches the lead from aside.
