AbstractA composite was prepared at room temperature from nitrogen-doped reduced graphene oxide (N-rGO) and melamine via π-interaction. An ultra-sensitive electrochemical sensor for the determination of trace levels of bisphenol A (BPA) was obtained by coating a glassy carbon electrode (GCE) with the composite. The structure and morphology of composite were characterized by FTIR, Raman, XRD, XPS, SEM and TEM. Because of the synergetic effects of N-rGO and melamine, the modified GCE displays considerably enhanced sensitivity to BPA. The voltammetric response, typically measured at a peak of 0.48 V (vs. SCE) is linear in the 0.05 to 20 μM BPA concentration range, and the detection limit is 0.8 nM (at S/N = 3). The sensor is reproducible, stable and selective. It was applied to analyze baby bottles, drinking cups, mineral water bottles and shopping receipts that were spiked with BPA, and the recoveries reached 99.1–101.4%. Graphical abstractIllustration of fabricating the electrochemical sensor for detecting BPA. N-G/M: nitrogen-doped reduced graphene oxide and melamine composite; GCE: glassy carbon electrode

中文翻译：

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氮掺杂还原氧化石墨烯和三聚氰胺修饰的玻碳电极用于双酚A的超灵敏伏安测定

摘要 以氮掺杂还原氧化石墨烯（N-rGO）和三聚氰胺通过π-相互作用在室温下制备了复合材料。通过用复合材料涂覆玻璃碳电极 (GCE) 获得了一种用于测定痕量双酚 A (BPA) 的超灵敏电化学传感器。通过FTIR、Raman、XRD、XPS、SEM和TEM对复合材料的结构和形貌进行表征。由于 N-rGO 和三聚氰胺的协同作用，改性 GCE 对 BPA 的敏感性显着增强。伏安响应通常在 0.48 V（相对于 SCE）的峰值处测量，在 0.05 至 20 μM BPA 浓度范围内呈线性，检测限为 0.8 nM（S/N = 3）。该传感器具有可重复性、稳定性和选择性。它被应用于分析婴儿奶瓶、水杯、加入 BPA 的矿泉水瓶和购物收据，回收率达到 99.1-101.4%。制造用于检测 BPA 的电化学传感器的图形摘要图解。NG/M：氮掺杂还原氧化石墨烯和三聚氰胺复合材料；GCE：玻碳电极