Abstract Formaldehyde is a poison around us. We described an electrochemical sensor based on polypyrrole(PPy)-reduced gold for the sensitivity detection of formaldehyde. The pyrrole was modified on glassy carbon electrode by potentiostatic method to obtain PPy/GCE. The gold nanoparticles (AuNPs) were decorated to the PPy/GCE after the treatment of the polypyrrole by overpotential. Thus, a AuNPs-polypyrrole composite modified glassy carbon electrode (AuNPs /PPy/GCE) was obtained. The material was characterized by SEM, EDX and XPS. The optimization of modification conditions for polypyrrole and AuNPs was determined. The PPy/GCE modified by AuNPs has high conductivity and excellent catalytic activity because of its large current response. The formaldehyde detection sensor based on AuNPs /PPy/GCE was established, and the quantitative determination of formaldehyde was carried out by differential pulse voltammetry(DPV). The electrochemical sensor has high selectivity, reproducibility and stability for formaldehyde detection. The sensor can be used to detect formaldehyde in pure water with detection line of 20 μM. The sensor can also be used to detect formaldehyde in milk with detection line of 0.4 mM.

中文翻译：

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还原型AuNPs@PPY复合材料修饰电极电化学测定甲醛

摘要 甲醛是我们身边的毒药。我们描述了一种基于聚吡咯 (PPy) 还原金的电化学传感器，用于甲醛的灵敏度检测。通过恒电位法在玻碳电极上修饰吡咯得到PPy/GCE。在通过过电位处理聚吡咯后，金纳米粒子 (AuNPs) 被装饰到 PPy/GCE。因此，获得了AuNPs-聚吡咯复合改性玻碳电极（AuNPs /PPy/GCE）。该材料通过SEM、EDX和XPS表征。确定了聚吡咯和 AuNPs 改性条件的优化。AuNPs修饰的PPy/GCE由于其大电流响应而具有高电导率和优异的催化活性。建立了基于AuNPs/PPy/GCE的甲醛检测传感器，采用差示脉冲伏安法(DPV)对甲醛进行定量测定。该电化学传感器对甲醛检测具有较高的选择性、重现性和稳定性。该传感器可用于检测纯水中的甲醛，检测线为20 μM。该传感器还可用于检测牛奶中的甲醛，检测线为0.4 mM。