Journal
SENSORS AND ACTUATORS B-CHEMICAL
Volume 346, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.snb.2021.130558
Keywords
Conductive ink; Aqueous-based ink; Potentiometric electrode; Printed electronics
Funding
- INTI
- CONICET [PIP 11220150100967]
- ANPCyT [PICT 2014-3748, PICT 2017-2787]
- UTN PID [4769]
- BMBF [MinCyT-BMBF AL17/06]
- Universidad Nacional del Oeste
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A potentiometric pH sensor based on polyaniline was fabricated using two printing techniques, showing outstanding sensitivity and suitability for wearable technology applications.
pH sensors are extremely useful in various applications such as health, food and environmental monitoring. Due to this fact the development of planar, low-cost and high-performance pH sensors that can be fabricated in large scale are highly appreciated. In this work we fabricated a polyaniline-based potentiometric pH sensor using two printing techniques. The working electrode was fabricated by printing a carbon ink layer onto Valox (R) by screen printing and subsequently modifying its active area by printing with a polyaniline ink by inkjet printing. Different water-based formulations of the polyaniline ink using acrylic dispersions as binders were tested in order to optimize printability, adhesion, rub resistance and functionality of the printed electrodes. These electrodes showed an outstanding sensitivity (up to 69.1 mV/pH), slightly higher than polyaniline electrodes fabricated by electropolymerization onto carbon paste electrodes and also comparable to glass electrodes. Moreover, their response to synthetic sweat was analyzed, demonstrating that there are suitable for application in wearable technology.
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