PANI-Based Wearable Electrochemical Sensor for pH Sweat Monitoring

Nowadays, we are assisting in the exceptional growth research relating to development of wearable devices for sweat analysis. Sweat is a biofluid that contains useful health information and allows non-invasive, continuous comfortable collection. For this reason, it an excellent detection different analytes. In work, electrochemical sensors based on polyaniline thin films deposited flexible substrate polyethylene terephthalate coated with indium tin oxide were studied. Polyaniline abstained by potentiostatic deposition technique, applying potential +2 V vs. SCE 90 s. To improve sensor performance, electronic was modified reduced graphene oxide, obtained at constant ?0.8 200 s, then electrodeposited top as-deposited substrate. All samples characterized XRD, SEM, EDS, static contact angle FT-IR/ATR analysis correlate physical-chemical features performance sensors. The electrodes tested as pH range from 2 8, showing good behavior, sensitivity 62.3 mV/pH, very close Nernstian response, reproducibility 3.8%. Interference tests, presence competing ions, aimed verify selectivity, also performed. Finally, real sample collected, quantified both proposed commercial meter, concordance.