  We report electronic transport measurements in nanoscale graphene transistors
with gold and platinum electrodes whose channel lengths are shorter than 100
nm, and compare them with transistors with channel lengths from 1 \textmu{}m to
50 \textmu{}m. We find a large positive gate voltage shift in charge neutrality
point (NP) for transistors made with platinum electrodes but negligible shift
for devices made with gold electrodes. This is consistent with the transfer of
electrons from graphene into the platinum electrodes. As the channel length
increases, the disparity between the measured NP using gold and platinum
electrodes disappears.
