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Chloride and pH Determination on a Wireless, Flexible Electrochemical Sensor Platform
IEEE Sensors Journal ( IF 4.3 ) Pub Date : 2020-01-15 , DOI: 10.1109/jsen.2019.2944407
Sindre Sopstad , Kristin Imenes , Erik A. Johannessen

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:

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。
更新日期:2020-01-15
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