Abstract A sensing system, based on tailor-made qPDMAEMA polymers, with the ability to discriminate between methanol and ethanol vapors in the presence or absence of humidity without the need of a separation column and at room temperature is designed and implemented. The miniaturized sensing system is comprised of four polymer coated planar capacitors along with the readout electronic module. The capacitors are fabricated with mainstream microelectronic/micromachining processes forming a planar InterDigitated Electrodes outline with 1 μm critical dimension. Tailor-made, hydrophilic homopolymers and a copolymer based on poly((2-dimethylamino)ethyl methacrylate), synthesized via GTP and quaternized with either methyl iodide or 1-(chloromethyl)naphthalene were used as the sensing layer and were compared to a hydrophobic, commercially available polymer. The sensing system was evaluated upon exposure to humidity, volatile organic compounds and binary mixtures of the latter. Data processing with Principal Component Analysis (PCA) highlights the ability of the proposed sensing system to discriminate between polar analytes, and more importantly between low molecular weight alcohol vapors, ethanol and methanol, in the presence of humidity.

中文翻译：

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基于 PDMAEMA 聚合物的可逆化学电容器系统，用于快速检测 VOC 混合物

摘要 设计并实现了一种基于定制 qPDMAEMA 聚合物的传感系统，该系统能够在湿度存在或不存在的情况下区分甲醇和乙醇蒸气，而无需分离柱和室温。微型传感系统由四个聚合物涂层平面电容器和读出电子模块组成。电容器采用主流微电子/微加工工艺制造，形成具有 1 μm 临界尺寸的平面 InterDigitated 电极轮廓。特制的亲水均聚物和基于聚（（2-二甲氨基）乙基甲基丙烯酸乙酯）的共聚物，通过 GTP 合成并用甲基碘或 1-（氯甲基）萘季铵化作为传感层，并与疏水, 市售聚合物。传感系统在暴露于湿度、挥发性有机化合物和后者的二元混合物时进行评估。使用主成分分析 (PCA) 进行的数据处理突出了所提出的传感系统在存在湿度的情况下区分极性分析物的能力，更重要的是区分低分子量酒精蒸汽、乙醇和甲醇的能力。