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Nitrated polythiophene (NPTh) was examined for the detection of amine vapors. When the polymer film was exposed to vapors of biogenic amines (BAs) such as ethylenediamine, putrescine, and cadaverine, its color darkened instantly. Accordingly, the ultraviolet-visible (UV–vis) absorption spectra showed a significant hyperchromic shift, indicating the formation of an intermolecular charge transfer complex...
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