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Highly sensitive mercury detection using electroactive gold-decorated polymer nanofibers
Sensors and Actuators B: Chemical ( IF 8.4 ) Pub Date : 2020-12-01 , DOI: 10.1016/j.snb.2020.129267
Farideh Hosseini Narouei , Leah Livernois , Daniel Andreescu , Silvana Andreescu

Easy to use devices for the rapid detection of toxic metal ions in water or food samples are essential for identifying, monitoring and effectively managing the effects of heavy metal pollution. We report a novel conductive nanofibrillar structure with a high number of nitrogen binding sites as a general strategy for enhancing detection sensitivity of electrodes for mercury ions (Hg2+) quantification by anodic stripping voltammetry (ASV). The nanofibers are made of a conductive copolymer, poly(aniline-co-o-aminophenol) – PANOA – decorated with gold nanoparticles (Au NPs) homogenously distributed throughout the fibrillar structure grown directly onto the surface of low cost disposable working electrodes. The synergistic effect arising from the high affinity provided by the large number of nitrogen functional groups (imine, amino, amido) in the PANOA and the Au NPs enabled the development of a very sensitive sensor for Hg2+ with a detection limit of 0.23 nM and a linear dynamic range between 0.8 and 12.0 nM, using a 180 s pre-concentration step. The sensor was selective for Hg2+ in the presence of As, Pb, Cu, Zn and Cd ions. An example application for detection of Hg2+ in river water as well as fish samples was demonstrated. The method provides a broadly applicable strategy to increase sensitivity of electrochemical sensors for field monitoring of heavy metal ion pollution.



中文翻译:

使用电活性金装饰的聚合物纳米纤维进行高灵敏的汞检测

用于快速检测水或食物样品中有毒金属离子的易于使用的设备对于识别,监控和有效管理重金属污染的影响至关重要。我们报告了一种新型的导电纳米原纤维结构,具有大量的氮结合位点,作为通过阳极溶出伏安法(ASV)增强汞离子(Hg 2+)定量电极检测灵敏度的一般策略。纳米纤维由导电共聚物,聚(苯胺- CO-O-氨基苯酚-PANOA-装饰有金纳米颗粒(Au NPs),均匀分布在直接生长在低成本一次性工作电极表面上的整个原纤维结构中。PANOA和Au NP中大量氮官能团(亚胺,氨基,酰胺基)提供的高亲和力所产生的协同效应使Hg 2+传感器的灵敏度非常高,检测极限为0.23 nM使用180 s的预浓缩步骤,线性动态范围在0.8到12.0 nM之间。在As,Pb,Cu,Zn和Cd离子存在下,传感器对Hg 2+具有选择性。检测Hg 2+的示例应用证明了在河水以及鱼类样本中的作用。该方法提供了广泛适用的策略,以提高用于现场监测重金属离子污染的电化学传感器的灵敏度。

更新日期:2020-12-14
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