A good method to fabricate fully inkjet printed Ag/AgCl reference electrodes has been described by Moya
et al.92 (link) NovaCentrix, Metalon (JS-B40G, Austin, TX) silver ink was used to print the silver layers on Kapton substrate and then sintered at 250 °C for 30 min. Then, PriElex Microchem (Westborough, MA) SU-8 ink was printed on top of the silver layers for passivation and then sintered 250 °C for 50 min. For chlorination, diluted
NaClO (5 v/v% purchased from Sigma-Aldrich) was printed (2 passes) on the exposed silver and then washed with deionized water. For the formulation of a protecting membrane, a cocktail mixture of PVB (Butvar B-98) (10 w%) in
methanol (40%),
xylene (30%),
diacetone alcohol (15%), and
1-butanol (15%), all purchased from Sigma-Aldrich, was printed (5 passes) on top of the chlorinated area. Lastly, the electrode was left in a fume hood to dry overnight.
Pandhi T., Cornwell C., Fujimoto K., Barnes P., Cox J., Xiong H., Davis P.H., Subbaraman H., Koehne J.E, & Estrada D. (2020). Fully inkjet-printed multilayered graphene-based flexible electrodes for repeatable electrochemical response. RSC Advances, 10(63), 38205-38219.