Bendable Electronics and Sensing Technology Group, School of Engineering, University of Glasgow, Glasgow G128QQ, UK.
Biosensors (Basel). 2019 Jan 16;9(1):14. doi: 10.3390/bios9010014.
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.
在这项工作中，我们展示了一种基于纺织基底的用于可穿戴应用的电位 pH 传感器。敏感（厚膜石墨复合材料）和参比电极（Ag/AgCl）被印刷在纤维素-聚酯混合布上。印刷电极之间具有优异的附着力，使得基于纺织品的传感器可以水洗且具有可靠的 pH 响应。所开发的基于纺织品的 pH 传感器基于电化学反应工作，通过电位、循环伏安法（100 mV/s）和电化学阻抗谱（10 mHz 至 1 MHz）分析可以观察到这一点。通过电化学阻抗谱分析观察到敏感电极- pH 溶液相互作用的双电层形成和离子交换。通过电位分析表明，所制备的基于纺织品的传感器在 pH 范围为 6⁻9 时表现出 4 mV/pH 的灵敏度（斜率因子）和 5 s 的响应时间。即使在自来水洗涤后，该传感器在长达 2000 s 的时间内仍具有 47 ± 2 mV 的稳定响应电位。这些结果表明该传感器可用于可穿戴应用。
