Improvement of the Ir/IrO2 pH electrode via hydrothermal treatment

Wang, Dandan; Yang, Cheng‐Ta; Xia, Jinfeng; Xue, Zhenhai; Jiang, Danyu; Zhou, Guohong; Zheng, Xiaohong; Zheng, Huiping; Du, Yong; Li, Qiang

doi:10.1007/s11581-017-2058-1

Cited by 12 publications

(15 citation statements)

References 39 publications

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“…However, the dry films produced exhibit significant aging effects. 271 Sufficient hydration during fabrication and preparation of electrodes has proven to be a key factor in reducing the amount of potential drift. 271 One method studied was high-temperature hydrothermal hydration treatment where Ir/IrO 2 electrodes were subjected to hydration at 220 °C for 24 h and then soaked in deionized water.…”

Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

“…271 Sufficient hydration during fabrication and preparation of electrodes has proven to be a key factor in reducing the amount of potential drift. 271 One method studied was high-temperature hydrothermal hydration treatment where Ir/IrO 2 electrodes were subjected to hydration at 220 °C for 24 h and then soaked in deionized water. Tested within a pH range of 1.68−12.47, electrodes that underwent this method exhibited good stability over the course of 40 days, attributed to the more orderly crystal arrangement and high content of OH − groups as shown in Figure 11c.…”

Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

“…Tested within a pH range of 1.68−12.47, electrodes that underwent this method exhibited good stability over the course of 40 days, attributed to the more orderly crystal arrangement and high content of OH − groups as shown in Figure 11c. 271 Measured cell potentials were carried out against a commercial Ag/AgCl (saturated KCl) RE in OCP configuration, and the device sensitivity range is −70.5 mV/pH with a constant intercept at 0 pH (standard reduction potential difference between sensing and RE) of 800.5 mV over the 40 days. When the same device was hydrated in DI water at room temperature for 24 h, a significant drift in the intercept at 0 pH from 901 to 563 mV was observed.…”

Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

“…(c) Fitting curves of 13 tests after 24 h of hydrothermal hydration of Ir/IrO 2 at 220 °C, recorded over 40 days. Measured cell potentials were carried out against a commercial Ag/AgCl (saturated KCl) RE; the device sensitivity range is −59 to −70.5 mV/pH . (d) Hysteresis of ∼5 μA measured in ZnO/SiNWs-based pH sensor in extended gate field effect transistor (EGFET) configuration, as a time vs drain source current, with sensitivity of −66 mV/pH .…”

Section: Challengesmentioning

confidence: 99%

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Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

et al. 2019

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pH-sensing materials and configurations are rapidly evolving toward exciting new applications, especially those in biomedical applications. In this review, we highlight rapid progress in electrochemical pH sensors over the past decade (2008–2018) with an emphasis on key considerations, such as materials selection, system configurations, and testing protocols. In addition to recent progress in optical pH sensors, our main focus in this review is on electromechanical pH sensors due to their significant advances, especially in biomedical applications. We summarize developments of electrochemical pH sensors that by virtue of their optimized material chemistries (from metal oxides to polymers) and geometrical features (from thin films to quantum dots) enable their adoption in biomedical applications. We further present an overview of necessary sensing standards and protocols. Standards ensure the establishment of consistent protocols, facilitating collective understanding of results and building on the current state. Furthermore, they enable objective benchmarking of various pH-sensing reports, materials, and systems, which is critical for the overall progression and development of the field. Additionally, we list critical issues in recent literary reporting and suggest various methods for objective benchmarking. pH regulation in the human body and state-of-the-art pH sensors (from ex vivo to in vivo) are compared for suitability in biomedical applications. We conclude our review by (i) identifying challenges that need to be overcome in electrochemical pH sensing and (ii) providing an outlook on future research along with insights, in which the integration of various pH sensors with advanced electronics can provide a new platform for the development of novel technologies for disease diagnostics and prevention.

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Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

Section: Stability Of Ph-sensing Devicesmentioning

confidence: 99%

Section: Challengesmentioning

confidence: 99%

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Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

et al. 2019

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“…Among the above-mentioned methods for preparing iridium electrode, the traditional electrodeposition method requires complex deposition solution with strict ratio. 32,33 Thermal oxidation and thermal sputtering require high-temperature oxidation instruments, 34,35 which are generally expensive, further limiting the application of iridium-based electrodes. In this study, the bulk iridium electrode using simple self-electrodeposition approach was prepared by cyclic voltammetry (CV) technology, which has the advantages of cost effectiveness, simple preparation, and good response performance.…”

mentioning

confidence: 99%

In Vivo Molecular Insights into Syntrophic Geobacter Aggregates

et al. 2020

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Direct and accurate monitoring of pH in turbid waters is a challenging task for environmental monitoring and analysis. In this study, iridium oxide (IrO 2 ) with selective sensing ability toward H + was produced on the surface of iridium (Ir) electrode by rapid self-electrodeposition. IrO 2 was deposited on electrode surface by atomic force, which could decrease the adverse effect of the suspended particles in turbid water. Properties of the Ir/IrO 2 electrode were investigated by X-ray photoelectron spectroscopy, scanning electron microscopy, and electrochemical technology. The sensitivity and response time of the Ir/IrO 2 electrode for pH determination were assessed, and a rapid and linear pH response of approximately 65 ± 3.5 mV pH −1 was observed across a wide pH range between 1.8 and 11.9. Moreover, the electrode exhibited a good temperature linearity (20 °C-60 °C), low potential drift (0.75 mV h −1 ), high accuracy (±0.05), and a long life span (up to 30 d). The practical investigation revealed faster equilibrium rate and higher stability of the Ir/IrO 2 electrode than that of traditional glass pH electrode. Furthermore, the Ir/IrO 2 electrode was successfully used for in situ pH monitoring in 750 formazin turbidity units (FTU) for turbid coastal river water. Therefore, the developed Ir/IrO 2 pH electrode offers large applicability for in situ pH monitoring in turbid environmental water matrices.

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Reference‐Attached pH Nanosensor for Accurately Monitoring the Rapid Kinetics of Intracellular H⁺ Oscillations

Wen,

Qi,

Jiao

et al. 2024

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Intracellular pH (pHi) is an essential indicator of cellular metabolic activity, as its transient or small shift can significantly impact cellular homeostasis and reflect the cellular events. Real‐time and precise tracking of these rapid pH changes within a single living cell is therefore important. However, achieving high dynamic response performance (subsecond) pH detection inside a living cell with high accuracy remains a challenge. Here a reference‐attached pH nanosensor (R‐pH‐nanosensor) with fast and precise pHi sensing performance is introduced. The nanosensor comprises a highly conductive H+‐sensitive IrRuOx nanowire (SiC@IrRuOx NW) as the intracellular working electrode and a SiC@Ag/AgCl NW as an intracellular reference electrode (RE) to diminish the interferences arising from cell membrane potential fluctuations. This whole‐inside‐cell detection mode ensures that the entire potential detection circuit is located within the same cell, and the R‐pH‐nanosensor is able to quantify the mild acidification of cytosol and completely record the fast pH variation within a single cell. It also enables real‐time potentiometric monitoring of the pHi oscillations, which synchronize with the glycolysis oscillations in cancer cells. Furthermore, the asymmetry in glycolysis oscillations wave is disclosed and the inhibitory effect of just lactate to glycolysis oscillations is further confirmed.

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Improvement of the Ir/IrO2 pH electrode via hydrothermal treatment

Cited by 12 publications

References 39 publications

Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

In Vivo Molecular Insights into Syntrophic Geobacter Aggregates

Reference‐Attached pH Nanosensor for Accurately Monitoring the Rapid Kinetics of Intracellular H⁺ Oscillations

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Improvement of the Ir/IrO2 pH electrode via hydrothermal treatment

Cited by 12 publications

References 39 publications

Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

Recent Progress in Electrochemical pH-Sensing Materials and Configurations for Biomedical Applications

In Vivo Molecular Insights into Syntrophic Geobacter Aggregates

Reference‐Attached pH Nanosensor for Accurately Monitoring the Rapid Kinetics of Intracellular H+ Oscillations

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Product

Resources

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Reference‐Attached pH Nanosensor for Accurately Monitoring the Rapid Kinetics of Intracellular H⁺ Oscillations