期刊
ACS MEASUREMENT SCIENCE AU
卷 2, 期 6, 页码 568-575出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsmeasuresciau.2c00036
关键词
reference electrode; solid-contact; potentiometric; sensing; ion-selective electrodes; wearable sensors
资金
- National Natural Science Foundation of China [21974032, 21974031, U2006208]
- Science and Technology Research Project of Guangzhou [202102020622]
- Department of Science and Technology of Guangdong Province [2019B010933001]
Solid-contact ion-selective electrodes are ion measurement devices with miniaturization and integration features. The solid-contact reference electrodes (SC-REs) using silver/silver tetraphenylborate (Ag/AgTPB) organic insoluble electrode offer reproducible standard potential and high long-term stability.
Solid-contact ion-selective electrodes are a type of ion measurement devices that have been focused in wearable biotechnology based on the features of miniaturization and integration. However, the solid-contact reference electrodes (SC-REs) remain relatively less focused compared with numerous working (or indicator) electrodes. Most SC-REs in wearable sensors rely on Ag/AgCl reference electrodes with solid electrolytes, for example, the hydrophilic electrolyte salts in polymer matrix, but face the risk of electrolyte leakage. Herein, we report a type of SC-REs based on the silver/silver tetraphenylborate (Ag/AgTPB) organic insoluble electrode. The SC-RE consists of a Ag substrate, a solid contact (AgTPB), and a plasticized poly(vinyl chloride) (PVC) membrane containing the hydrophobic organic salt of tetrabutylammonium tetraphenylborate (TBATPB). The potentiometric measurements demonstrated that the SC-RE of Ag/AgTPB/PVC-TBATPB showed a reproducible standard potential in various electrolytes and disclosed high long-term stability. This SC-RE was further fabricated on a flexible substrate and integrated into all-solid-state wearable potentiometric ion sensor for sweat Cl- monitoring.
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