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. 2020 Jun 23;10(6):128. doi: 10.3390/membranes10060128

Figure 1.

Figure 1

An overview from liquid-contact ion-selective electrodes (LC-ISEs) to solid-contact ISEs (SC-ISEs) for wearable sensors. (A) Classic LC-ISEs (e.g., pH meter) by a liquid-contact between internal solution and ion-selective membrane (ISM). (B) The structure of SC-ISEs by a solid-contact between solid ion-to-electron transducer layer and ISM. (C) An example of the SC-ISEs for wearable sensor applications [9].