Evaluating Platinum‐Based Ionic Polymer Metal Composites as Potentiometric Sensors for Dissolved Ozone in Ultrapure Water Systems

Abstract

Monitoring the content of dissolved ozone in purified water is often mandatory to ensure the appropriate levels of disinfection and sanitization. However, quantification bears challenges as colorimetric assays require laborious off-line analysis, while commercially available instruments for electrochemical process analysis are expensive and often lack the possibility for miniaturization and discretionary installation. In this study, potentiometric ionic polymer metal composite (IPMC) sensors for the determination of dissolved ozone in ultrapure water (UPW) systems are presented. Commercially available polymer electrolyte membranes are treated via an impregnation-reduction method to obtain nanostructured platinum layers. By applying 25 different synthesis conditions, layer thicknesses of 2.2 to 12.6 μm are obtained. Supporting radiographic analyses indicate that the platinum concentration of the impregnation solution has the highest influence on the obtained metal loading. The sensor response behavior is explained by a Langmuir pseudo-isotherm model and allows the quantification of dissolved ozone to trace levels of less than 10 μg L −1 . Additional statistical evaluations show that the expected Pt loading and radiographic blackening levels can be predicted with high accuracy and significance (R 2 adj. > 0.90, p < 10 −10 ) solely from given synthesis conditions.

Performance Optimization of Ionic Polymer Sensors through Characteristic Regulation of Chemically Prepared Interfacial Electrodes

“…In view of the light weight, thinness, and good deformability of polymers, polymer-based ionic sensors have been the most commonly used. − Incorporating biocompatible biodegradable polymers with conductive polymers to develop conductive polymeric composites for tissue engineering applications is a very important application direction of polymer-based sensors . Ionic polymer sensors (IPSs) typically consist of two layers of conductive electrodes sandwiching an ionic polymer matrix. , When deformed, the ions inside the ionic polymer matrix will migrate directionally under the action of pressure gradient and form an electric double layer (EDL) along the interface between the electrodes and the matrix to realize the conversion of ionic signals to electrical signals. , Therefore, the area of the formed EDL will affect the amplitude of the output voltage, which is usually determined by the preparation process.…”