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.

中文翻译：

---

灵活的基于氧化铱的 pH 传感器集成电感耦合无线传输系统，用于可穿戴应用

这项工作提出了一种 pH 传感器平台，将循环伏安法制造的氧化铱 (IrOx) 的高性能与电感耦合无线 (ICW) 传输相结合。包含的数据显示了灵活的电位 pH 传感器，其以 IrOx 作为传感电极，以固化的 Ag/AgCl 糊状物作为伪参比电极；显示了关于通过制造工艺进行性能定制的进一步研究。制造的传感器显示出最佳性能，探针表面积为 ${1}\times {1}$ mm2，以 100 mV/s 电沉积进行 100 次循环伏安法 (CV) 扫描。制造的传感器的灵敏度通常在 65-75 mV/pH 范围内，使用 pH 4-9（六点）或 2-10（五点）缓冲液进行测试。在缓冲溶液中表现出这些敏感性的传感器产生了来自“人造汗液”溶液的响应，该溶液与商业玻璃 pH 电极相差约 0.4-0.8 pH，而定量限 (LOQ) 测量为约 0.04-0.08 pH。感应电极的响应时间小于 2 秒，滞后效应最小。高达 1M Na+ 的阳离子干扰导致灵敏度发生 +3–8 mV/pH 变化，这取决于溶液 pH 值和探针，对 LOQ 的影响最小。柔性传感器探头在不同弯曲条件下（0°、55 毫米半径 30°、37 毫米 45° 和 20 毫米 90°）下的性能变化可以忽略不计。最后，所提出的传感器与电感耦合无线 (ICW) 通信系统集成，用于在线监测演示。