Figure 4.
Schematic diagrams and images of micro-patterned electrodes: (a) Graphene electrode fabrication process based on a polymer material (reprinted under terms of the CC-BY license [11]. Copyright 2018, the authors. Published by Springer Nature). (b) Copper electrode fabrication process based on paper substrate (reprinted under terms of the CC-BY license [99]. Copyright 2018, the authors. Published by MDPI). (c) AgNPs electrode fabrication process via aerosol jet printing (reprinted under terms of the CC-BY license [30]. Copyright 2020, the authors. Published by Science). (d) Flexible dry Ag/AgCl electrode fabrication process via screen printing (reprinted with permission [100]. Copyright 2016 Elsevier).