Implementation of Smart Dressing Systems Based on Flexible pH Sensors Using PET Films

Seok-Oh YUN  Jung Hoon LEE  Jin LEE  Choul-Young KIM  

IEICE TRANSACTIONS on Information and Systems   Vol.E102-D   No.8   pp.1572-1575
Publication Date: 2019/08/01
Online ISSN: 1745-1361
DOI: 10.1587/transinf.2019EDL8056
Type of Manuscript: LETTER
Category: Computer System
pH sensor,  pH meter,  smart dressing,  wound infection,  

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In this paper, a smart dressing system was implemented based on flexible pH sensors that can monitor the infection of a wounded area by tracking the pH value of the area. Motivated by the fabrication process widely used for semiconductors, the flexible pH sensor fabrication process was devised with a polyester (PET) film and a Si wafer, which deposits Au and Ag on a PET film. Because the electrodes are comprised of a working electrode and a reference electrode, the reference electrode was fabricated by synthesizing the Polyaniline (PANI) on Ag/AgCl, while the pH sensor has four channels to evenly measure the pH value in a wide area. The smart dressing system was constructed with four pH sensors, a single temperature sensor, a level shifter, a regulator, an analog-to-digital converter (ADC), and a monitoring PC. The measurement results show that our smart dressing system has a size of 5×5cm2 and can monitor the pH value range found in [3,9] with a sensitivity slope of 50mV/pH.