Large scale roll-to-roll coating process to enhance the optical and electrical properties for transparent conductive single-walled carbon nanotube /silver nanowire hybrid film

For the application of the touch screen panel and transparent conductive electrode for the flexible display, highly transparent and electrically conductive film is required. To enhance the optical properties and the surface... [ view full abstract ]

For the application of the touch screen panel and transparent conductive electrode for the flexible display, highly transparent and electrically conductive film is required. To enhance the optical properties and the surface conductivity of carbon nanotube (CNT)/silver nanowire/polyethylene terephthalate (PET) hybrid film, inorganic overcoating has been applied by roll-to-roll coating processing. The maximum total transmittance of the hybrid film without washing and overcoating was less than 90%. The optimum thickness of the overcoating has been determine as 10 micrometer for the highest total transmittance, 92 %, while the sheet resistance of the hybrid film is 180 ohm/sq. For the further enhancement of the sheet resistance of the CNT/silver nanowire hybrid film to get less than 80 ohm/sq the thickness of the overcoating has been controlled as 30 micro meter, while the transmittance is more than 90%. The overcoating of nanoparticle can highly reduce the surface roughness of the CNT/silver nanowire hybrid film and enhance the optical clarity such as the total transmittance and the haze of the hybrid film. This work has been done using large scale roll-to-roll coating machine for the scalable product of the high performance flexible transparent conductive film.