A stamp-sized, flexible, wireless, generic electrochemical sensor platform was demonstrated for use as a potentiometric pH and amperometric Cl⁻ sensor. The platform combines flexible printed circuit technology with screen-printed electrodes, which enables cheap and easy quantification of biorelevant analytes in many different environments. pH sensors with graphene oxide as the recognition element was constructed on a ferrocyanide modified carbon electrode, to maintain a well-defined redox potential even at high alkalinity. A solid-state reference electrode based on a NaCl-doped polyvinyl butyral membrane ensured applicability towards sample matrices of unknown composition by remining unsensitive (±7.1 mV) to external Cl⁻ in the range pCl 0–3. The platform was able to linearly (−26.3 mV pH⁻¹, r² = 0.99) quantify pH in the range of 2–9 with a maximum inter-sensor standard deviation of 0.43 pH units. Secondly, a Cl⁻ sensor combining three unmodified Ag/AgCl electrodes with squarewave amperometry was designed, simulated and tested. A sensitivity of (−147.7 $\mu \text{A}$ pCl⁻¹, r² = 0.97) was obtained, with a maximum inter-sensor standard deviation of 0.27 pCl units in the range pCl 0–3.

中文翻译：

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在无线、灵活的电化学传感器平台上测定氯化物和 pH 值

邮票大小的、灵活的、无线的、通用的电化学传感器平台被证明用作电位 pH 和电流型 Cl ^-传感器。该平台将柔性印刷电路技术与丝网印刷电极相结合，可以在许多不同环境中对生物相关分析物进行廉价且轻松的量化。以氧化石墨烯作为识别元件的 pH 传感器构建在亚铁氰化物改性的碳电极上，即使在高碱度下也能保持明确的氧化还原电位。基于 NaCl 掺杂的聚乙烯醇缩丁醛膜的固态参比电极通过重新识别对外部 Cl ^{- 不}敏感 (±7.1 mV) 来确保对未知成分的样品基质的适用性在 pCl 0–3 范围内。该平台能够线性（-26.3 mV pH ^-1，r ² = 0.99）量化 2-9 范围内的 pH，最大传感器间标准偏差为 0.43 pH 单位。其次，设计、模拟和测试了一个将三个未修改的 Ag/AgCl 电极与方波电流法相结合的 Cl ^-传感器。灵敏度为 (-147.7 $\mu \text{A}$ 获得了 pCl ^-1 , r ² = 0.97)，在 pCl 0–3 范围内，最大传感器间标准偏差为 0.27 pCl 单位。