Ultrathin, long-term stable, solid-state reference electrode enabled by enhanced interfacial adhesion and conformal coating of AgCl
- Authors
- Lim, Hyo-Ryoung; Hillman, Nathan; Kwon, Young-Tae; Kim, Yun-Soung; Choa, Yong-Ho; Yeo, Woon-Hong
- Issue Date
- Apr-2020
- Publisher
- Elsevier BV
- Keywords
- All-solid-state reference electrode; Ultrathin electrode; Long-term stability; Interfacial adhesion; Conformal coating; Biosensors
- Citation
- Sensors and Actuators, B: Chemical, v.309, pp 1 - 11
- Pages
- 11
- Indexed
- SCIE
SCOPUS
- Journal Title
- Sensors and Actuators, B: Chemical
- Volume
- 309
- Start Page
- 1
- End Page
- 11
- URI
- https://scholarworks.bwise.kr/erica/handle/2021.sw.erica/1161
- DOI
- 10.1016/j.snb.2020.127761
- ISSN
- 0925-4005
0925-4005
- Abstract
- Continuous biochemical monitoring with a flexible electrochemical sensor offers a new wearable electronic system that can measure real-time voltage and current signals. The signal quality is determined by long-term stability of a silver/silver chloride reference electrode (Ag/AgCl RE). However, it is very challenging for any solid-state electrode to have a long-term stable operation. Even though new membrane technologies have improved the voltage stability, the existing thin film Ag/AgCl REs have limitations of insufficient film adhesion and structural instability. Here, this paper introduces an ultrathin, all-solid-state RE that demonstrates a long-term functional stability for more than two weeks via enhanced interfacial adhesion and conformal coating of AgCl. An optimization of chlorination factors allows a highly uniform, 800 nm-thick RE surface. The voltage response of the sensor in a saline solution shows a change of 0.09 mV/h for 18 days with a quasi-stable behavior, capturing the potential as an amperometric biosensor. Moreover, the characterization with an enzymatic working electrode verifies that two-electrode system using the thin-film RE has a sensitivity (S = 606 nA.mmol(-1.) cm(-2)), compatible to that with a commercial RE (S = 532 nA.mmol(-1.) cm(-2)). Collectively, this work provides a comprehensive study of materials and surface functionalization of all-solid-state REs for thin-film biosensors, which will pave the way for long-term usable wearable biosystems.
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