N-Nitrosodiphenylamine (NDPhA), a typically nonvolatile N-nitrosamine (NA), is widely used as an additive in daily human necessities and is considered as a possible cancer-causing substance by the US Environmental Protection Agency. Therefore, the determination of NDPhA in environment is crucial to people's health. In this study, a simple and high-performance electrochemical sensor for NDPhA detection is constructed based on poly(diallyldimethylammonium chloride)-stabilized graphene/platinum nanoparticles (PDDA–Gr/PtNPs) as an electrochemical sensing platform. The PDDA–Gr/PtNP nanocomposite is synthesized by a facile wet-chemical approach. It combines the prominent properties of graphene (large surface areas and high conductivity) with the outstanding catalytic activity of Pt nanoparticles. Because of its remarkable synergistic effect, a PDDA–Gr/PtNP-modified glassy carbon electrode (PDDA–Gr/PtNPs/GCE) shows excellent performance towards electrooxidation of NDPhA with a significantly increased peak current and negatively shifted peak potential compared to graphene-modified electrode (PDDA–Gr/GCE); it exhibits good linearity for NDPhA detection with a linear range of 1.0 × 10⁻⁷–5.0 × 10⁻⁵ mol L⁻¹ and a detection limit of 3.3 × 10⁻⁸ mol L⁻¹ (S/N = 3) under optimum conditions. Moreover, this cost-effective and convenient sensor also has good stability, repeatability and anti-interference ability and is promising for trace analysis of NAs in environmental pollutants.

中文翻译：

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基于聚二烯丙基二甲基氯化铵稳定的石墨烯/铂纳米粒子 的痕量N-亚硝基二苯胺的 电化学传感器

N-亚硝基二苯胺（NDPhA），通常为非易失性N亚硝胺（NA）被广泛用作人类日常必需品的添加剂，被美国环境保护署认为是可能的致癌物质。因此，环境中NDPhA的测定对人们的健康至关重要。在这项研究中，基于聚二烯丙基二甲基氯化铵稳定的石墨烯/铂纳米粒子（PDDA-Gr / PtNPs）作为电化学传感平台，构建了一种用于NDPhA检测的简单而高性能的电化学传感器。PDDA-Gr / PtNP纳米复合材料是通过一种简便的湿化学方法合成的。它结合了石墨烯的突出特性（大表面积和高电导率）与Pt纳米颗粒的出色催化活性。由于其显着的协同作用，与石墨烯修饰电极（PDDA-Gr / GCE）相比，PDDA-Gr / PtNP修饰的玻碳电极（PDDA-Gr / PtNPs / GCE）表现出优异的NDPhA电氧化性能，峰值电流显着增加，峰电位负移）; 它具有良好的线性度，可用于NDPhA检测，线性范围为1.0×10在最佳条件下， ⁻⁷ –5.0×10 ^-5 mol L ^-1和检测极限为3.3×10 ^-8 mol L ^-1（S / N = 3）。此外，这种经济高效且方便的传感器还具有良好的稳定性，可重复性和抗干扰能力，有望用于痕量分析环境污染物中的NAs。