Owing to the lack of chromophores and ionizable functional groups, it is a significant challenge to determine perfluorooctane sulfonyl fluoride (PFOSF) by traditional high-performance liquid chromatography or liquid chromatography/mass spectrometry, especially at a low concentration. In this work a unique photoelectrochemical (PEC) sensing strip has been developed for the first time for the detection of PFOSF. The sensing strip is cost effective and disposable, whereby BiOI nanoflake arrays are fabricated on a home-made screen-printed electrode through a facile one-step in-situ electrodeposition process, and then the molecule tags (i.e., molecularly imprinted polymers) for PFOSF are subsequently grafted on the surface. Benefitting from a three-dimensional interconnected framework, the as-fabricated sensing strip has a rapid response to the interfacial steric hindrance effect between the sensing platform and the target analyte of PFOSF. The elaborated PEC sensor exhibits a outstanding linear response to a concentration of PFOSF ranging from 0.05 to 500.0 ppb and a detection limit down to 0.01 ppb (S/N = 3) Furthermore, our low-cost and highly sensitive sensor has been further explored to detect PFOSF in real water samples, showing satisfactory results.

由于缺乏发色团和可电离的官能团，通过传统的高效液相色谱法或液相色谱/质谱法（尤其是低浓度）测定全氟辛烷磺酰氟（PFOSF）是一项重大挑战。在这项工作中，首次开发了一种独特的光电化学（PEC）感测条，用于检测PFOSF。传感条具有成本效益且可一次性使用，因此，BiOI纳米片阵列通过简便的一步式原位电沉积工艺，然后通过PFOSF的分子标签（即分子印迹聚合物），在自制的丝网印刷电极上制造随后将其嫁接到表面上。得益于三维互连框架，制成的传感带对传感平台与PFOSF的目标分析物之间的界面位阻效应具有快速响应。精细的PEC传感器对PFOSF的浓度范围为0.05至500.0 ppb表现出出色的线性响应，检测极限低至0.01 ppb（S / N = 3）。此外，我们进一步探索了低成本和高灵敏度的传感器，在真实水样中检测PFOSF，结果令人满意。