  In this work an electron radiation detector microdevices were fabricated and
characterized. The devices consisted of a conductive electrospun mat made of
polycaprolactone loaded with multiwalled carbon nanotubes and fullerene C60
deposited onto gold interdigitated microelectrodes. They were capable of
permanently increase their conductivity upon exposure to electron beam
irradiation from 0.02 pC/{\mu}m2 accelerated at 10 and 20 keV. This phenomenon
could be explained due to the ability of C60 to trap and stabilize negative
charges and thus contribute to the conductivity of the polymer composite. The
devices achieved their maximum conductivity at an irradiation between 0.22 and
0.27 pC/{\mu}m2 and this maximum was dependent of the electron acceleration.
Montecarlo simulations were performed to explain dependence as function of
electron penetration in the polymer composite. Moreover, the devices irradiated
at 20keV maintained their final conductivity and the devices irradiated at
10keV increased their final conductivity after 6 days from irradiation.
Fullerenes proved to act as highly efficient electron scavengers within the
polymer composite and contribute to its conductivity, and the microdevice has
potential application as beta radiation sensors.
