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Microelectrodes fabrication processes: local laser ablation of PMMA etches interdigitated microchannels that are filled with carbon paste using doctor blading (a1–a4) and DLW is used on a thin Loctite layer as a protective coating to chemically etch a PCB copper board (b1–b5) Scale bars are 500 µm and 1 mm for (a4) and (b5) respectively.
