Highly flexible transparent conductive graphene/single-walled carbon nanotube nanocomposite films produced by Langmuir-Blodgett assembly

Transparent conductive films (TCFs) composed of ultra-large graphene oxide (UL-GO) and functionalized single-walled carbon nanotubes (SWCNTs) are assembled on a flexible poly(ethylene terephthalate) (PET) substrate using the Langmuir-Blodgett (L-B) technique. After being reduced by hydriodic (HI) acid, the TCFs provide excellent optical and electrical properties with a remarkable sheet resistance of 8.1 k Omega sq(-1) at a transmittance of 90.3%. It is also found that the deposition of an additional layer of a hydrophilic coating on the PET substrate could greatly improve the hydrophilicity of PET, which is mainly due to the introduced hydrophilic functional groups and high surface roughness of the coating layer. This highly efficient, self-assembly approach could be used to fabricate TCF devices without post-transfer processes on a large-scale.