▎ 摘　　要

NOVELTY - An ultrasonic spray coating involves (a) operating an ultrasonic spray device to form aerosol droplets (212, 214) of first dispersion comprising first conducting nano filaments in first liquid where the nano filaments have a dimension less than 200 nm; (b) forming aerosol droplets of second dispersion or solution comprising graphene material in second liquid; (c) depositing the aerosol droplets of first dispersion and the aerosol droplets of second dispersion or solution onto a supporting substrate (216); and (d) removing the first liquid and second liquid from the droplets. USE - As ultrasonic spray coating for producing an optically transparent and electrically conductive film (claimed), used in transparent conductive electrodes for solar cell, photo-detector, light-emitting diode, touch screen, and display device applications. ADVANTAGE - The method provides a substitute for indium tin oxide (ITO) with a similar sheet resistance and transparency performance, but at a lower cost, higher flexibility, durability, and integrity. The film exhibits an optical transparence not less than 80% and sheet resistance not greater than 300 ohm/square. DETAILED DESCRIPTION - An ultrasonic spray coating involves (a) operating an ultrasonic spray device to form aerosol droplets (212, 214) of a first dispersion comprising first conducting nano filaments in a first liquid where the nano filaments have a dimension less than 200 nm; (b) forming aerosol droplets of a second dispersion or solution comprising a graphene material in a second liquid; (c) depositing the aerosol droplets of a first dispersion and the aerosol droplets of a second dispersion or solution onto a supporting substrate (216); and (d) removing the first liquid and the second liquid from the droplets to form the optically transparent and electrically conductive film, which is composed of the first conducting nano filaments and the graphene material having a nano filament-to-graphene weight ratio of 1/99-99/1, where the film exhibits an optical transparence not less than 80% and sheet resistance not greater than 300 ohm/square. DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of an ultrasonic spray coating based system. Ultrasonic spray heads (200, 202) Piezoelectric transducer (204, 206) Dispensing nozzle (208, 210) Aerosol droplets (212, 214) Supporting substrate (216) Heating element (218) Feeder roller (220) Collector roller (222)