Abstract
In this work, we present a potentiometric pH sensor on textile substrate for wearable applications. The sensitive (thick film graphite composite) and reference electrodes (Ag/AgCl) are printed on cellulose-polyester blend cloth. An excellent adhesion between printed electrodes allow the textile-based sensor to be washed with a reliable pH response. The developed textile-based pH sensor works on the basis of electrochemical reaction, as observed through the potentiometric, cyclic voltammetry (100 mV/s) and electrochemical impedance spectroscopic (10 mHz to 1 MHz) analysis. The electrochemical double layer formation and the ionic exchanges of the sensitive electrode-pH solution interaction are observed through the electrochemical impedance spectroscopic analysis. Potentiometric analysis reveals that the fabricated textile-based sensor exhibits a sensitivity (slope factor) of 4 mV/pH with a response time of 5 s in the pH range 6–9. The presented sensor shows stable response with a potential of 47 ± 2 mV for long time (2000 s) even after it was washed in tap water. These results indicate that the sensor can be used for wearable applications.
Highlights
There have seen a surge in the development of wearable and disposable devices for health-monitoring applications
The surface morphology of graphite and Ag conductive electrodes on the cloth substrate is illustrated in the surface microscopic (SEM) image of Figure 2a
PHsensor sensorpresented presentedhere hereis is suitable wearable applications, The suitable forfor wearable applications, as as evident from extensive analysis of the thick-film sensitive and reference (Ag/AgCl) evident from extensive analysis of the thick-film sensitive and reference (Ag/AgCl) electrodes printed cellulose-polyester blend
Summary
There have seen a surge in the development of wearable and disposable devices for health-monitoring applications. The current technology for the development of such disposable sensors often relies on the use of non- degradable polymers, which could have negative environmental impact. Such issues could be alleviated by developing sensors on the eco-friendly substrate. The textile-based electrochemical biosensors are attractive for non-invasive monitoring of chronic diseases as they nicely conform to the body surface without any side effects such as skin irritation and loss of vital health data. The textile-based pH sensors [11] are interesting as they allow monitoring of physiological response through sweat analysis and could give information about the metabolic activity of the body or diseases such as diabetes [24,25,26,27,28,29]. The pH of other body fluids can be used to determine distinct types of cancers, the healing process of wounds, cell proliferation, blood glucose levels, and metabolic activities of body etc. [1,2,3,4,32]
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