A clean 25 x 50 x 1.1 mm ITO covered (~130 nm, Rs = 5 -15 Ω/sq) glass plates obtained from Delta Technologies (Loveland, CO, USA) were patterned directly (ablated) with a desktop CO2 laser engraving machine -C180II purchased from GCC (New Taipei City, Taiwan) using a CAD design with the following parameters: speed 2.0, power 1% and PPI 1500 (Fig. ). The laser locally heats up the ITO layer on glass to the point it cracks and detaches from the glass plate. Finally, the ITO plates were sonicated in acetone, isopropanol, and distilled water for 15 minutes each. Each test plate consisted of 8 electrodes. Copper tape was used improving the electrical connections to the potentiostat and Kapton tape for masking the connections so that only the electrodes were exposed.