Fig. 6: Direct drawing method and the fabricated devices.
From: Paper-based flexible electronic devices: processing, integration, and applications

a Schematic diagram of preparation of electrodes and fabrication of all-solid-state SCs and (b) variation of resistance with distance on the GP electrode surface92. c The layout of the electrode (left) and the electrical contacts and reference electrode coated with silver ink are drawn in pencil on the sandpaper substrate (right)93.