Characterization of flexible pH micro-sensors based on electrodeposited IrOx thin film

Marsh, Paul; Moore, Wyatt; Clucas, Mark; Huynh, Ly Thi Minh; Kim, Kyoung‐Tae; Yi, Sangheon; Cao, Hung; Chiao, Jung-Chih

doi:10.1109/icsens.2017.8234322

Cited by 5 publications

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“…We carried out an investigation of the influence on sensing performance via (i) number of deposition sweeps, (ii) sweep rate, and (iii) surface area of the electrode. In our previous reports, we showed that sensors with surface areas of 0.5×0.5 mm 2 , 0.3×0.3 mm 2 , and 0.2×0.2 mm 2 demonstrate mean sensitivities of 61.6 mV/pH, 52.2 mV/pH, and 50.7 mV/pH, respectively [35]. For the batch used in this work, the baseline 1×1 mm 2 sensitivity was 70.6 mV/pH.…”

Section: Results Discussion and Conclusionsupporting

confidence: 52%

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Flexible Iridium Oxide Based pH Sensor Integrated With Inductively Coupled Wireless Transmission System for Wearable Applications

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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 1×1 mm 2 , 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-ofquantification (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 (0º, 30º at 55 mm radius, 45º at 37 mm, and 90º 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.

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Section: Results Discussion and Conclusionsupporting

confidence: 52%

“…Sensitivity is strongly influenced by deposition parameters, including area [35] of the electrode. We carried out an investigation of the influence on sensing performance via (i) number of deposition sweeps, (ii) sweep rate, and (iii) surface area of the electrode.…”

Section: Results Discussion and Conclusionmentioning

confidence: 99%

Flexible Iridium Oxide Based pH Sensor Integrated With Inductively Coupled Wireless Transmission System for Wearable Applications

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A Technical Review on Existing pH Detection and Monitoring Technology for in-Vivo Diagnostic Application

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et al. 2020

2020 IEEE 12th International Conference on Humanoid, Nanotechnology, Information Technology, Communication and Control, Environ

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Performance of IrO_x pH Sensor Prepared by Electrochemical and Thermal Oxidation

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Characterization of flexible pH micro-sensors based on electrodeposited IrOx thin film

Cited by 5 publications

References 4 publications

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

A Technical Review on Existing pH Detection and Monitoring Technology for in-Vivo Diagnostic Application

Performance of IrO_x pH Sensor Prepared by Electrochemical and Thermal Oxidation

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Characterization of flexible pH micro-sensors based on electrodeposited IrOx thin film

Cited by 5 publications

References 4 publications

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

A Technical Review on Existing pH Detection and Monitoring Technology for in-Vivo Diagnostic Application

Performance of IrOx pH Sensor Prepared by Electrochemical and Thermal Oxidation

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Performance of IrO_x pH Sensor Prepared by Electrochemical and Thermal Oxidation