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 HSbF 6, is in situ generated from UV-epoxy. HSbF 6 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.