Potentiometric ion-selective sensors based on UV-ozone irradiated laser-induced graphene electrode

Disposable devices for sensing biomarkers like Na+ ion in sweat was developed using UV-Ozone irradiated laser-induced graphene (LIG) based electrodes. Solid-state ion-selective electrodes (ISEs) sensitive to ions were fabricated by a two-step drop-coating process of polyvinyl chloride solution containing plasticizer, ionophore and ion-exchanger on LIG electrode. Hydrophobic hydrophilic transition induced treatment reduced the contact angle, resulting better permeation membrane into ozonized film. Raman spectroscopy IR absorption studies indicate physisorption ozone LIG. Performance (O-LIG) much than pristine screen-printed carbon Sensitivity 60.2 ± 0.9 mV/ decade lower limit detection 1 × 10?6 M achieved O-LIG ISEs. Response time around min.