Surface renewable nano-iridium oxide polymeric composite pH electrodes

Park, Jong-Man; Kim, Moonhee; Kim, Shinseon

doi:10.1016/j.snb.2014.07.104

Cited by 20 publications

(16 citation statements)

References 22 publications

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“…76 For example, nano-porous IrO x exhibited a response time of 100 s while that of a dense lm is less than 2 s. As a result, the pH response for this reaction is (3/2) (RT/F) ¼ 88.74 mV per pH at 25 C. If IrO x is partially hydrated, thus a Nernst slope between 59.16 and 88.5 mV per pH should be obtained.…”

Section: Potentiometric Sensormentioning

confidence: 99%

“…The electrical conductivity of pH sensitive material being used at the potentiometric sensing electrode should not be low for the transfer of electrons generated by the redox reactions. 76 Generally, the IrO x electrodes have near-Nernstian response (59.16 mV per pH), because the amount of transferred electrons equals to the amount of reacted H 3 O + . Several of these are now described.…”

Section: Potentiometric Sensormentioning

confidence: 99%

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Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

et al. 2015

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Continuous, real-time monitoring of the level of pH and free chlorine in drinking water is of great importance to public health. However, it is challenging when conventional analytical instruments, such as bulky pH electrodes and expensive free chlorine meters, are used. These instruments have slow response, are difficult to use, prone to interference from operators, and require frequent maintenance. In contrast, microfabricated electrochemical sensors are cheaper, smaller in size, and highly sensitive.Therefore, these sensors are desirable for online monitoring of pH and free chlorine in water. In this review, we discuss different physical configurations of microfabricated sensors. These configurations include potentiometric electrodes, ion-sensitive field-effect transistors, and chemo-resistors/transistors for electrochemical pH sensing. Also, we identified that micro-amperometric sensors are the dominant ones used for free chlorine sensing. We summarized and compared the structure, operation/sensing mechanism, applicable materials, and performance parameters in terms of sensitivity, sensing range, response time and stability of each type of sensor. We observed that novel sensor structures fabricated by solution processing and operated by smart sensing methodologies may be used for developing pH and free chlorine sensors with high performance and low cost. Finally, we highlighted the importance of the concurrent design of materials, fabrication processes, and electronics for future sensors.

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Section: Potentiometric Sensormentioning

confidence: 99%

Section: Potentiometric Sensormentioning

confidence: 99%

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

et al. 2015

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“…[24][25][26][27][28][29][30] Concretely speaking, the pH sensing mechanism relies on the establishment of a surface equilibrium between the metal (M) and its oxide (MOx) when in contact with the test medium:…”

Section: Resultsmentioning

confidence: 99%

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

Zhang

Hou

et al. 2016

J. Electrochem. Soc.

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A new antimony pH electrode by employing magnetron sputtering Sb thin film on copper substrates inlaying in printed circuit board (PCB) was developed. To improve the performance of the electrode, nafion membrane was employed as an alternative modification layer. The layer was formed simply by drop casting 5 wt% nafion solutions and drying the resultant coating. Further, the effect of the thickness of the Sb sensing thin film on the performance of antimony pH electrodes was investigated. Surface morphology, energy spectrum, and electrochemical experiments were conducted in Sb thin film thickness of ∼50, ∼150, ∼240, and ∼330 nm. Experimental results demonstrated excellent features of the pH electrodes with ∼240 nm thickness Sb thin film, including high sensitivity, short response time, high resolution, stability, reversibility, and long-term stability. The pH electrode is low cost, high performance, and simple preparation, is promising to popularize in laboratory and industrial production.As a typical electrochemical sensor, pH sensor has been received much attention in various fields, such as food spoilage monitoring, water pollution monitoring, soil pollution monitoring, biomedical sensing, industrial and chemical processing and structural health monitoring, where pH measurements are vital for the characterization of aqueous solutions. 1 Currently the most widely used technique for determination of pH in laboratory is the glass pH electrode. While the performance of the glass electrodes is excellent in terms of high sensitivity, long-term stability, high ion selectivity and wide operating range, such electrodes have many disadvantages including mechanical fragile, need for wet storage, large size, limited shape, high impedance and high cost. 2,3 Drawbacks of glass electrodes have led to intensive research for alternative pH electrodes. Potentiometric metal/metal oxide electrodes have proven to be some of the most promising candidates. 4 Various metals and metal oxides, such as Ti/TiO 2 , Zr/ZrO 2 , W/WO 3 , Ir/IrO 2 , Sb/Sb 2 O 3 , Ru/RuO 2 , and Pd/PdO, have been investigated for pH electrodes due to important attractive features, such as insolubility, mechanical strength, electro catalyst, stability, and manufacturing technology. 1,5-8 Among them, Ir/IrO 2 , Ru/RuO 2 , and Sb/Sb 2 O 3 have been popular research points recently. Some relative studies have been conducted in last decade.For Ir/IrO 2 , many groups tried to fabricate the iridium oxide electrode with some different manufacturing methods, for example, a novel melt-oxidized method, a new carbonate melt oxidation method, the electrodeposited method, the sol-gel fabrication process, and so on. 4,6,[9][10][11] For Ru/RuO 2 , Maurya et al. designed a miniaturized pH sensor employing an R. F. sputtered RuO 2 thin-film electrode in conjunction with an electroplated Ag/AgCl reference electrode, and some factors, such as temperature effects, Ar/O 2 flow ratio, and electrode thickness, were studied. The ruthenium oxide thin-film electrodes were applied in engin...

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“…The pH is an essential parameter in ecological environments and biological organisms, and different pH values can influence the growth rate of cells, metabolic rates, cell division, and differentiation [1][2][3][4]. Some researchers have shown that the carbon cycles of marine coral ecosystems and even of global ecosystems are affected by fluctuating pH values, and pH fluctuations caused by wastewater discharge into upstream rivers will also affect downstream ecosystems [5][6][7][8].…”

Section: Introductionmentioning

confidence: 99%

pH electrodes based on iridium oxide films for marine monitoring

Zhou

Pan

et al. 2020

Trends in Environmental Analytical Chemistry

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The pH is an important parameter that affects the growth and development of marine organisms, environmental changes, and industrial and agricultural production processes. Nowadays, important trends in pH detection and analysis are higher stability, adaptation to extreme environmental conditions, miniaturization, portability, and digital intelligence. Several studies have focused on the application of the iridium oxide film (IROF) pH electrodes in water quality monitoring and physiological analysis. The central aim of this work was to review the preparation techniques of the IROF pH electrodes and to expand their application in the field of marine monitoring. The studied methods include electrochemical deposition, electrochemical growth, sputtering deposition, heat treatment, and novel preparation methods. The IROF pH electrodes prepared via these methods are more sensitive, have a wider pH measurement ranges, and can be miniaturized further than traditional glass and pH photometer. Hence, in environmental analysis, combining IROF pH electrodes with wireless technology for the physiological and biochemical analysis of marine organisms, seawater, and sediment pore water is an important development tendency.

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Surface renewable nano-iridium oxide polymeric composite pH electrodes

Cited by 20 publications

References 22 publications

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

Microfabricated electrochemical pH and free chlorine sensors for water quality monitoring: recent advances and research challenges

The Effects of Antimony Thin Film Thickness on Antimony pH Electrode Coated with Nafion Membrane

pH electrodes based on iridium oxide films for marine monitoring

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