Abstract
This study presents a significant advancement in the application of a freestanding potentiometric pH sensor patch made of PDMS, incorporating a sensing electrode of Sb2O3/Sb thin film and a reference electrode of AgIO3/Ag thin film. The pH sensing electrodes of Sb2O3/Sb/Au/Ni and AgIO3/Ag/Au/Ni thin films were deposited over the PDMS/cellulose acetate/Si substrate using the ECR/RF sputtering technique. The pH sensor prepared on the PDMS/cellulose acetate/Si substrate displayed excellent sensitivity (−58.24 to −60.84 mV/pH, n = 4) and a robust linear response (R2 ∼ 0.99) in a wider pH range (1.68–9.18). The flexible on-skin wearable pH sensors were obtained by peeling off the pH sensor-assisted PDMS sheet from the Si substrate, which exhibited a remarkable sensitivity of -54.29 mV/pH and a linear pH response (R2 ∼ 0.99). Real-time sweat sensing experiments confirmed the accuracy of the developed flexible on-skin wearable pH sensors in monitoring pH levels at different body parts.
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