Used as a functional polymer in sensors due to its ability to detect trace amounts of metal ions and organic vapors. Its conjugated structure and amine groups enable selective binding and signal transduction in electrochemical and optical sensing platforms. Also applied in controlled drug delivery systems where pH-responsive behavior allows for targeted release in acidic environments such as tumor tissues. Serves as a precursor in conductive polymers for flexible electronics and coatings. Additionally, employed in wastewater treatment for adsorption of heavy metals and dyes owing to its high surface area and active binding sites.