Flexible electronics for skin wearable pH sensor
Hafenstine, Rex W.
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Hafenstine, R. W. 2020. Flexible electronics for skin wearable pH sensor -- In Proceedings: 16th Annual Symposium on Graduate Research and Scholarly Projects. Wichita, KS: Wichita State University, p.32
INTRODUCTION: Recent advances in soft, flexible, hybrid electronics allow to develop a novel wearable platform for direct sweat collection and analysis in real-time. The unobtrusive and mechanically compliant system can provide a gentle, conformal integration onto the skin and offer the comfortable, long-term and continuous monitoring of sweat that overcomes the limitations of conventional technologies. In order to develop such system, however, a number of biosensors are essential that can be miniaturized and are mechanically compatible while providing reliable and accurate measurements. As the first step, we have successfully developed a IrOx based solid state pH sensor. It was built on ultrathin metal wires, which can be bendable with minimal forces. 1% nafion membrane and 1mM 6-merceptohexanol (MCH) were applied on IrOx electroplated working electrode and/or Ag/AgCl reference electrode to significantly improve the response time, stability, and reliability of the sensor. As a result, the long-term test demonstrated that the pH sensor provides accurate readings with a super-Nernstian response of -68.4±2.3 mV/pH for extended periods of time.
Honorable mention in the poster presentations at the 16th Annual Symposium on Graduate Research and Scholarly Projects (GRASP) held online, Wichita State University, May 1, 2020.
Research completed in the Department of Biomedical Engineering, College of Engineering