Flexible Iridium Oxide Based pH Sensor Integrated With Inductively Coupled Wireless Transmission System for Wearable Applications
Flexible Iridium Oxide Based pH Sensor Integrated With Inductively Coupled Wireless Transmission System for Wearable Applications
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DOI：
10.1109/jsen.2020.2970926
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发表时间：
2020-05
影响因子：
4.3
通讯作者：
Paul Marsh;Libu Manjakkal;Xuesong Yang;Miguel Huerta;Tai Le;L. Thiel;J. Chiao;H. Cao;R. Dahiya
中科院分区：
文献类型：
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作者：
Paul Marsh;Libu Manjakkal;Xuesong Yang;Miguel Huerta;Tai Le;L. Thiel;J. Chiao;H. Cao;R. Dahiya
本工作提出了一种pH传感器平台相结合的高性能的氧化铱（IrOx）通过循环伏安法与电感耦合无线（ICW）传输制造。所包括的数据提出了灵活的电位pH传感器具有IrOx作为传感电极和固化的Ag/AgCl糊剂作为伪参考电极，通过制造工艺的性能定制的进一步调查显示。所制造的传感器显示出最佳的性能，探针表面积为${1}\times {1}$mm2，电沉积为100循环伏安法（CV）扫描，在100 mV/s。所制造的传感器的灵敏度通常在65-75 mV/pH的范围内，如使用pH 4-9（六点）或2-10（五点）缓冲液测试的。在缓冲溶液中表现出这些灵敏度的传感器产生了对“人造汗液”溶液的响应，其与商业玻璃pH电极的pH相差约0.4-0.8，而定量限（LOQ）被测量为约0.04-0.08 pH。传感电极显示出小于2秒的响应时间和最小的滞后效应。高达1 M Na+的阳离子干扰导致灵敏度变化为+3-8 mV/pH，这取决于溶液pH和探针，对LOQ的影响极小。柔性传感器探头在不同弯曲条件（0°、30°，半径55 mm，45°，37 mm，90°，20 mm）下的性能变化可忽略不计。最后，所提出的传感器集成了电感耦合无线（ICW）通信系统的在线监测的示范。该传感器平台可以很容易地小型化，因为所需的组件数量少，并且没有板载能量存储。
This work presents a pH sensor platform combining the high performance of iridium oxide (IrOx) fabricated by cyclic voltammetry with inductively-coupled wireless (ICW) transmission. Data included presents flexible potentiometric pH sensors having IrOx as the sensing electrode and a cured Ag/AgCl paste as the pseudo-reference electrode; further investigations concerning performance tailoring via fabrication processes are shown. The fabricated sensors show the best performance with a probe surface area of ${1}\times {1}$ mm2, electrodeposited for 100 cyclic voltammetry (CV) sweeps, at 100 mV/s. The sensitivity of the fabricated sensor is typically in the range of 65–75 mV/pH, as tested using either pH 4–9 (six points) or 2–10 (five points) buffers. The sensors exhibiting those sensitivities in buffer solutions yielded a response from “artificial sweat” solutions differing by ~0.4–0.8 pH from a commercial glass pH electrode, while limit-of-quantification (LOQ) was measured to be ~0.04–0.08 pH. The sensing electrode shows a response time of less than 2 seconds and minimal hysteresis effects. Cationic interferences from up to 1M Na+ resulted in +3–8 mV/pH changes in sensitivity, depending on solution pH and probe, with minimal effects to LOQ. The performance under different bending conditions (0°, 30° at 55 mm radius, 45° at 37 mm, and 90° at 20 mm) of the flexible sensor probe show negligible variation. Finally, the presented sensors were integrated with an inductively coupled wireless (ICW) communication system for a demonstration of online monitoring. This sensor platform can easily be miniaturized due to a low count of necessary components and absence of onboard energy storage.