UV-Epoxy-Enabled Simultaneous Intact Transfer and Highly Efficient Doping for Roll-to-Roll Production of High-Performance Graphene Films

Flexible
graphene transparent conductive films (TCFs) prepared
by chemical vapor deposition hold great promise for next-generation
wearable optoelectronic devices, but the lack of low-cost scalable
intact transfer and highly efficient doping greatly limits their commercialization.
Here, we report a UV-epoxy adhesive as a robust multifunctional layer
for the low-cost scalable production of high-performance flexible
graphene TCF. Its high solvent stability, sufficient adhesion force,
and conformal contact with graphene enable the intact bubbling transfer
of graphene. More importantly, a highly strong and stable p-dopant,
superacid HSbF6, is in situ generated from UV-epoxy. HSbF6 substantially increases the hole concentration of pristine
graphene by more than 10 times and consequently reduces its sheet
resistance by up to 95% with high stability. Furthermore, it can be
readily integrated with the roll-to-roll transfer process. These features
enable continuous production of graphene TCFs with overall performances
superior to those produced by common transfer methods and typical
dopants. As an example, we demonstrate the use of this film in the
capacitive multitouch panel of tablet computers.