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Moal, Fred Le
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article
Spray-Coating Thin Films on Three-Dimensional Surfaces for a Semitransparent Capacitive-Touch Device.
Abstract
Here we formulate low surface tension (~30 mN/m) and low boiling point (~79 °C) inks of graphene, single wall carbon nanotubes (SWNTs) and conductive polymer poly(3,4- ethylenedioxythiophene) poly(styrenesulfonate) (PEDOT:PSS) and demonstrate their viability for spray-coating of morphologically uniform (Sq ~ 48 ± 3 nm), transparent conducting films (TCFs) at room temperature (~ 20 °C), which conform to three dimensional (3D) curved surfaces. Large area (~ 750 cm^2) hybrid PEDOT:PSS/graphene films achieved an optical transmission of 67% in the UV and 64% in the near-infrared (n-IR) wavelengths with a conductivity of ~104 S/m. Finally, we demonstrate the spray coating of TCFs as an electrode on the inside of a poly(methyl methacrylate) (PMMA) sphere enabling a semitransparent (around 360°) and spherical touch sensor for interactive devices.