Department of Materials Science and Engineering, Texas A&M University, College Station, TX 77843, USA.
Department of Electrical and Computer Engineering, Texas A&M University, College Station, TX 77843, USA.
Sensors (Basel). 2020 Dec 19;20(24):7301. doi: 10.3390/s20247301.
Perfluorinated compounds like perfluorooctanesulfonic acid (PFOS) are synthetic water pollutants and have accumulated in environments for decades, causing a serious global health issue. Conventional assays rely on liquid chromatography and mass spectroscopy that are very expensive and complicated and thus limit the large-scale monitoring of PFOS in wastewater. To achieve low-cost and accurate detection of PFOS, we designed a paper-based sensor with molecularly imprinted polyaniline electrodes that have recognition sites specific to PFOS. The calibration curve of resistivity ratios as a function of PFOS concentrations has a linear range from 1 to 100 ppt with a coefficient of determination of 0.995. The estimated limit of detection is 1.02 ppt. We also investigated attenuated total reflectance Fourier-transform infrared spectroscopy (ATR-FTIR) and X-ray photoelectron spectroscopy (XPS) spectra of the surface of the polyaniline (PANI) electrodes to propose the potential recognition sites in polyaniline matrix and the detection mechanism. This electrical paper sensor with low cost and excellent sensitivity and selectivity provides the potential for large-scale monitoring of wastewater.
全氟化合物，如全氟辛烷磺酸 (PFOS)，是合成的水污染物质，已经在环境中积累了数十年，导致了严重的全球健康问题。传统的检测方法依赖于液相色谱和质谱，这些方法非常昂贵和复杂，因此限制了废水中 PFOS 的大规模监测。为了实现低成本和准确检测 PFOS，我们设计了一种基于纸张的传感器，其具有对 PFOS 具有特异性识别位点的分子印迹聚苯胺电极。电阻率比与 PFOS 浓度的校准曲线在 1 到 100 ppt 范围内呈线性，决定系数为 0.995。估计的检测限为 1.02 ppt。我们还研究了聚苯胺 (PANI) 电极表面的衰减全反射傅里叶变换红外光谱 (ATR-FTIR) 和 X 射线光电子能谱 (XPS) 光谱，以提出聚苯胺基质中的潜在识别位点和检测机制。这种具有低成本、优异灵敏度和选择性的电子纸传感器为大规模监测废水提供了潜力。
