Spray-Coating Thin Films on Three-Dimensional Surfaces for a Semitransparent Capacitive-Touch Device

Here, we formulate low surface tension (similar to 30 mN/m) and low boiling point (similar to 79 degrees C) inks of graphene, single-wall carbon nanotubes and conductive polymer poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS) and demonstrate their viability for spray-coating of morphologically uniform (S-q approximate to 48 +/- 3 nm), transparent conducting films (TCFs) at room temperature (similar to 20 degrees C), which conform to three dimensional Spray Nozzle curved surfaces. Large area (similar to 750 cm(2)) hybrid PEDOT:PSS/graphene films achieved an optical transmission of 67% in the UV and 64% in the near-infrared wavelengths with a conductivity of similar to 10(4) S/m. Finally, we demonstrate the spray-coating of TCFs as an electrode on the inside of a poly(methyl methacrylate) sphere, enabling a semitransparent (around 360 degrees) and spherical touch sensor for interactive devices.