A wearable electrochemical sensor based on ?-CD functionalized graphene for pH and potassium ion analysis in sweat

Here, we developed a wearable electrochemical sensor for pH and K+ monitoring in sweat. The sensor was composed of flexible reference electrode, pH response electrode and K+ selective electrode, which were prepared through printing beta-CD functionalized graphene (beta-CD/RGO) water suspension on conductive PET substrate with microelectronic printer. beta-CD/RGO not only served as the pH sensitive material for pH response electrode with good sensitivity, selectivity and reproducibility due to its abundant oxygen-containing functional groups, but also worked as the ion-to-electron transducer for K+ selective electrode with good sensitivity. The wearable sensor exhibited good potential stability at different bending states. On-body sweat pH and K+ measurements showed high accuracy compared with ex-situ analysis.

Automated summary

In this study, a wearable electrochemical sensor was developed for pH and K+ monitoring in sweat. The sensor consisted of flexible reference electrode, pH response electrode, and K+ selective electrode. The sensor exhibited good stability and accuracy in measuring sweat pH and K+ concentration.