Poly(o-phenylenediamine) with amine (–NH₂) functional group substitutions was chemically synthesized from the monomer o-phenylenediamine using ammonium persulfate oxidant in sulphuric acid medium. The synthesized polymer was soluble in organic solvent like dimethyl sulfoxide (DMSO), dimethyl formamide, etc. The sensing layer was fabricated by a simple drop coating method using the polymer solution in DMSO and the layer was doped with sulfuric acid doping using optimized doping conditions. An average resistance of the doped polymer layer was observed as 2–5 MΩ. The doped conducting polymer layer was used as chemiresistor for the successful sensing of ethanol and methanol or isopropanol contamination in ethanol. The response of doped polymer layer was examined under continuous flow of methanol, ethanol, isopropanol, ethanol/methanol, and ethanol/isopropanol with air mixture at room temperature (25 ± 3 °C) and room humidity (65 ± 5%). The sensing mechanism for doped functional poly(o-phenylenediamine) through –NH₂ group substitutions was explored with the help of various standard characterizations.

胺（–NH ₂）官能团取代的聚（邻苯二胺）是从单体邻域-苯二胺在硫酸介质中使用过硫酸铵氧化剂。合成的聚合物可溶于二甲基亚砜（DMSO），二甲基甲酰胺等有机溶剂中。传感层是使用聚合物在DMSO中的溶液通过简单的滴涂法制备的，并使用优化的掺杂条件对其进行了硫酸掺杂。观察到掺杂的聚合物层的平均电阻为2–5MΩ。掺杂的导电聚合物层用作化学传感器，用于成功感测乙醇中的乙醇和甲醇或异丙醇污染。在甲醇，乙醇，异丙醇，乙醇/甲醇和乙醇/异丙醇与空气混合物在室温（25±3°C）和室温（65±5％）的连续流动下检查掺杂的聚合物层的响应。借助各种标准表征，探索了通过–NH ₂基团取代的邻苯二胺）。