π-Conjugated polymers possessing beneficial properties such as optical features are promising materials as platforms for chemical sensors by introducing appropriate molecular recognition moieties. Among π-conjugated polymers, polythiophenes are representative materials with flexible backbones that enable the functionalization of side chains at the 3- and/or 4-positions. The dynamics of the polymer behavior by analyte capture cause optical changes, which allow real-sample analysis for food analysis, environmental assessments, and clinical applications. The author has attempted to establish polymer-based chemosensors and their chips on solid-state substrates for pattern recognition. The latest results of π-conjugated polymer-based sensors will be presented.
Supramolecular optical chemosensors are useful tools in analytical chemistry for the visualization of molecular recognition information. One advantage is that they can be utilized for array systems to detect multiple analytes. However, chemosensor arrays have been evaluated mainly in the solution phase, which limits a wide range of practical applications. Thus, appropriate solid support materials such as polymer gels and paper substrates are required to broaden the scope of the application of chemosensors as on-site analytical tools. Herein, the author proposes the actual approaches for the fabrication of solid-state chemosensor arrays combined with powerful data processing techniques and portable digital recorders for real-world applications.
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