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(a) Optical transmittance as a function of the sheet resistance, where the bulk regime is shown in yellow and the percolation regime shown in blue. Error was calculated by standard deviation of mean. (b) Gr-PEDOT:PSS-Eth ink is sprayed around two PMMA hemispheres, which are then joined to form a sphere. The conductive sphere is then connected to a microprocessor, which results in sound when touched. (c) Photo of the spray-coated semi-transparent capacitive-touch device.
