Abstract:
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: A graphene (Gr) on a polyimide (PI) polymer
film (Gr−PI film), obtained by a direct peel-off technique, is
proposed and investigated. Thanks to its high transparency,
electrical conductivity, mechanical strength, and chemical
durability, the Gr−PI film is an ideal substrate for flexible
electronic and optoelectronic devices, including transistors, lightemitting
diodes, and plasmonic antennas. It is obtained using a
straightforward method. After spin coating and curing a PI film
on Gr previously grown on Cu, one can separate the Gr−PI film
from the Cu foil thanks to the difference in the adhesive energy
between the Gr−Cu and Gr−PI interfaces. The resulting Gr−PI
film shows an average electrical sheet resistance ranging from 520 to 860 Ω/sq and a very high optical transmission (>90%),
which have allowed the demonstration of a transparent heater. The surface morphology of the Gr−PI film follows that of the Cu
foil, with the latter maintaining its surface properties and allowing in this way its reuse in subsequent chemical vapor deposition
growth. The me |