Surface functionalization of a chalcogenide IR photonic sensor by means of a polymer membrane for water pollution remediation,Analyst

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Surface functionalization of a chalcogenide IR photonic sensor by means of a polymer membrane for water pollution remediation
Analyst ( IF 3.6 ) Pub Date : 2024-07-24 , DOI: 10.1039/d4an00721b
Martin Vrážel ₁ , Raïssa Kadar Ismail _{2,

3} , Rémi Courson ₄ , Abdelali Hammouti ₅ , Marek Bouška ₁ , Amélie Larrodé ₂ , Marion Baillieul ₁ , William Giraud ₆ , Stéphane Le Floch ₆ , Loïc Bodiou ₅ , Joël Charrier ₅ , Kada Boukerma ₄ , Karine Michel ₃ , Petr Němec ₁ , Virginie Nazabal _{1,

2}

Affiliation

Rapid, simultaneous detection of organic chemical pollutants in water is an important issue to solve for protecting human health. This study investigated the possibility of developing an in situ reusable optical sensor capable of selective measurements utilizing a chalcogenide transducer supplemented by a hydrophobic polymer membrane with detection based on evanescent waves in the mid-infrared spectrum. In order to optimise a polyisobutylene hydrophobic film deposited on a chalcogenide waveguide, a zinc selenide prism was utilized as a testbed for performing attenuated total reflection with Fourier-transform infrared spectroscopy. To comply with the levels mentioned in health guidelines, the target detection range in this study was kept rather low, with the concentration range extended from 50 ppb to 100 ppm to cover accidental pollution problems, while targeted hydrocarbons (benzene, toluene, and xylene) were still detected at a concentration of 100 ppb. Infrared measurements in the selected range showed a linear behaviour, with the exception of two constantly reproducible plateau phases around 25 and 80 ppm, which were observable for two polymer film thicknesses of 5 and 10 μm. The polymer was also found to be reusable by regenerating it with water between individual measurements by increasing the water temperature and flow to facilitate reverse exchange kinetics. Given the good conformability of the hydrophobic polymer when coated on chalcogenide photonic circuits and its demonstrated ability to detect organic pollutants in water and to be regenerated afterwards, a microfluidic channel utilising water flow over an evanescent wave optical transducer based on a chalcogenide waveguide and a polyisobutylene (PIB) hydrophobic layer deposited on its surface was successfully fabricated from polydimethylsiloxane by filling a mold prepared via CAD and 3D printing techniques.

中文翻译：

通过聚合物膜对硫族化物红外光子传感器进行表面功能化，用于水污染修复

快速、同步检测水中有机化学污染物是保护人类健康需要解决的重要问题。这项研究研究了开发一种原位可重复使用光学传感器的可能性，该传感器能够利用由疏水性聚合物膜补充的硫族化物传感器进行选择性测量，并基于中红外光谱中的倏逝波进行检测。为了优化沉积在硫属化物波导上的聚异丁烯疏水膜，利用硒化锌棱镜作为利用傅里叶变换红外光谱进行衰减全反射的测试台。为了符合健康指南中提到的水平，本研究中的目标检测范围保持在较低水平，浓度范围从50 ppb扩展到100 ppm，以涵盖意外污染问题，而目标碳氢化合物（苯、甲苯和二甲苯）仍检测到浓度为 100 ppb。选定范围内的红外测量结果显示出线性行为，但在 25 和 80 ppm 左右的两个不断重复的稳定阶段除外，这对于厚度为 5 和 10 μm 的两种聚合物薄膜是可观察到的。还发现该聚合物可以重复使用，方法是在每次测量之间通过提高水温和流量以促进反向交换动力学，用水将其再生。鉴于疏水聚合物涂覆在硫族化物光子电路上时具有良好的一致性，并且其检测水中有机污染物并随后再生的能力，利用水流过基于硫族化物波导和聚异丁烯的倏逝波光学换能器的微流体通道通过填充通过CAD 和 3D 打印技术制备的模具，成功地用聚二甲基硅氧烷制备了沉积在其表面的 (PIB) 疏水层。

更新日期：2024-07-24

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