Recently, there has been an exceptional growth in research related to the development of flexible sensors for health monitoring and analysis. In particular, pH measurements can be done non-invasively and continuously, making it an excellent parameter for monitoring different stages of wound healing. Here, we report pH sensitivity of a polyaniline/graphite (PANI/G) composite in a fully-printed potentiometric pH sensor and the effect of graphite loading on sensor performance. PANI/G composites in different ratios were aerosol-jet printed on Ag/AgCl with and without a graphite layer as the working electrode in a two-electrode potentiometric sensor on a flexible substrate. The role of the graphite layer on the working electrode has been investigated. PANI/G composites were prepared by a solution processing method using a graphite paste and polyaniline emeraldine salt powder. Samples were characterized by x-ray diffraction, scanning electron microscopy, and Fourier-transform infrared spectroscopy analysis to investigate the relations between the physical and chemical components and the performance of the sensors. The sensors were tested in the pH range from 3 to 10, exhibiting a linear, stable and near-Nernstian sensitivity of 53 mV/pH and a response time of 15 s.
| Date | 31 Jan 2023 |
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| Original language | American English |
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| Awarding Institution | - École de technologie supérieure
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| Supervisor | Ricardo Izquierdo (Supervisor) & Andy Shih (Co-supervisor) |
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Mahinnezhad, S. (Author),
Izquierdo (Supervisor) &
Shih (Co-supervisor),
31 Jan 2023Student thesis: Master's thesis › Master in Engineering: Engineering