Development of a Combined pH‐ and Redox‐Sensitive Bi‐Electrode Glass Thin‐Film Sensor

Abstract

In this work, a combined pH‐ and redox‐sensitive bi‐electrode glass thin‐film sensor is developed for the simultaneous detection of pH and redox potential in aqueous solutions. Therefore, the pH‐ and redox‐sensitive glass bulk materials are prepared first by glass‐pouring processes and tailored regarding the sensing properties as well as the deposition suitability. A layout for the bi‐electrode transducer structure (sensor chip) is developed is been fabricated on a glass substrate via conventional thin‐film techniques. The sensitive glass bulk materials are transferred on the bi‐electrode structures by means of pulsed laser deposition technique (PLD). The fabricated sensors are physically and electrochemically characterized by means of scanning electron microscopy (SEM), Rutherford backscattering spectrometry (RBS), profilometry, impedance‐ and potentiometric measurements. The fabricated sensor structures are successfully tested in the range pH 5–9 and the redox potential in different solutions including also real test samples of soda and pool water.

A review on thin films, conducting polymers as sensor devices

“…Pan et al (2021) studied the structural and sensing characteristics of Nickel oxides sensing films for extended-gate field-effect transistor pH sensors. It was found that the NiOx sensing film showed a higher pH sensitivity after 500 °C post deposition annealing temperature [151]. The details of the pH sensors reviewed are given in table 3.…”

Preparation and properties of a novel polystyrene solid-phase fluorescence pH sensor based on a naphthalimide derivative

“…[3][4][5][6] However, glass electrodes have some disadvantages, such as electrochemical interference, their insuitablity for use under highpressure conditions, fragility, and high internal resistance. 7,8 In recent years, more and more chemical fluorescence sensors have been developed to detect pH due to their high sensitivity and rapid response. [9][10][11][12] However, most of them cannot be reused.…”