Electrochemical Impedance Spectroscopic Analysis of RuO2 Based Thick Film pH Sensors

Manjakkal, Libu; Djurdjic, Elvira; Cvejin, Katarina; Kulawik, J.; Zaraska, Krzysztof; Szwagierczak, D.

doi:10.1016/j.electacta.2015.04.048

Cited by 66 publications

(53 citation statements)

References 36 publications

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“…In an impedancemetric and/or conductimetric based sensor, any changes that occur on the surface of the sensitive electrode while reacting with solution, changes the electrical properties of the sensor [2,14,23,31]. For a constant pH, we see decrease in the impedance and increase in phase as the frequency increases.…”

Section: B Impedance Spectroscopic Analysis Of the Sensormentioning

confidence: 92%

“…In the case of TiO 2 , the dissociative chemisorption of water molecule results in the formation of surface hydroxyl group [15]. Due to adsorption/diffusion of H + /OH -ions the surface of TiO 2 becomes charged and it creates an electrical double layer structure by site binding theory [23,32]. With changes in the pH of a solution the contribution of both H + and OH -ions also varies.…”

Section: B Impedance Spectroscopic Analysis Of the Sensormentioning

confidence: 99%

“…6. Observed behavior of the sensor from the Nyquist plot in analyzed frequency range, was discussed in more details in Section III.C, but a large incomplete arc in the Nyquist plot is possibly due to charge transfer and ion exchange at the surface of the material while reacting with ions in the solution [14,23,31].…”

Section: B Impedance Spectroscopic Analysis Of the Sensormentioning

confidence: 99%

“…The fabrication procedure of the conductimetric pH was similar to that reported in [2,23]. We chose alumina as a substrate to investigate the performance of pure metal oxide and to avoid any reaction at metal-metal oxide interface.…”

Section: A Sensor Fabricationmentioning

confidence: 99%

“…These changes in impedance and phase of TiO 2 based sensor can be attributed to electrochemical surface reaction of H + /OH -ions with the oxide surface. When a metal oxide is introduced into an electrolyte, many electrochemical reactions occur at the oxide-solution surface [2,23]. In the case of TiO 2 , the dissociative chemisorption of water molecule results in the formation of surface hydroxyl group [15].…”

Section: B Impedance Spectroscopic Analysis Of the Sensormentioning

confidence: 99%

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TiO₂-Based Thick Film pH Sensor

et al. 2017

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Abstract-Miniaturized electrochemical pH sensors are increasingly in demand for application such as online monitoring of water quality and health monitoring. The metal oxides are the best candidates for sensing electrodes of such sensors as they offer high chemical stability. In this work, we present a novel approach to obtain interdigitated conductimetric pH sensor using screen printing of TiO 2 thick film on an alumina substrate. The microstructural and crystalline properties of the TiO 2 sensitive film were examined with scanning electron microscopy and Raman spectroscopy. The impedance spectroscopic studies of the fabricated thick film sensor were carried out in the frequency range of 5-20 kHz for the test solutions in the pH range of 4-10 and it was observed that the impedance of the film distinctly dependent on pH. Using the measured impedance data, we have also proposed an equivalent RC network model for the fabricated pH sensor. The physical meaning of the model parameters was determined by electrochemical impedance spectroscopic (EIS) analysis, and through statistical analysis it was found that all parameters are distinctly pH-dependent.

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Section: B Impedance Spectroscopic Analysis Of the Sensormentioning

confidence: 92%