A non-enzymatic sensor based on a curcumin modified pencil graphite electrode, loaded with molybdenum disulfide nanosheets decorated gold foam, was constructed. Herein, the electrochemical deposition strategy was adopted throughout the sensing platform design stepwise. The electroactivity of the pencil electrode platform enables sensitive simultaneous quantification of hydrazine and nitrite where the respective working potentials typically are at + 0.2 V for hydrazine and + 0.75 V for nitrite (both vs. Ag/AgCl, saturated KCl). It is shown that the resulting sensor demonstrates excellent analytical performances in terms of limits of detection (18.3, 21.7 nM), sensitivities (0.051, 0.061 μA μM-1), and reproducibility standard deviations (RSD) of 3.1 and 2.7% for hydrazine and nitrite, respectively. Furthermore, long term stability studies showed that the electrodes exhibited an effectively unchanged response after some 30 days. The sensor was used to analyze spiked samples of river water and industrial wastewater.

中文翻译：

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用二硫化钼纳米片修饰的姜黄素石墨铅笔电极修饰金泡沫，用于同时定量水样中的亚硝酸盐和肼

构建了基于姜黄素改性铅笔石墨电极的非酶传感器，负载有二硫化钼纳米片装饰的金泡沫。在此，电化学沉积策略在整个传感平台设计中逐步采用。铅笔电极平台的电活性能够对肼和亚硝酸盐进行灵敏的同时定量，其中肼和亚硝酸盐各自的工作电位通常为 + 0.2 V，亚硝酸盐为 + 0.75 V（均与 Ag/AgCl、饱和 KCl 相比）。结果表明，所得传感器在检出限 (18.3, 21.7 nM)、灵敏度 (0.051, 0.061 μA μM-1) 和再现性标准偏差 (RSD) 3.1% 和 2.7% 的肼和亚硝酸盐，分别。此外，长期稳定性研究表明，电极在大约 30 天后表现出有效的不变响应。该传感器用于分析河水和工业废水的加标样品。