Evanescent-Wave Fiber Optic Sensing of the Anionic Dye Uranine Based on Ion Association Extraction
Evanescent-Wave Fiber Optic Sensing of the Anionic Dye Uranine Based on Ion Association Extraction
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DOI：
10.3390/s20102796
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发表时间：
2020-05
期刊：
影响因子：
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通讯作者：
Takuya Okazaki;Tomoaki Watanabe;H. Kuramitz
中科院分区：
文献类型：
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作者：
Takuya Okazaki;Tomoaki Watanabe;H. Kuramitz
在此，我们提出了一种基于离子缔合萃取的阴离子染料铀氨酸的倏逝波光纤传感技术。通过从多模光纤去除一部分包层并对暴露的纤芯表面进行疏水化来制备传感器。铀与十六烷基三甲基铵（CTA）离子一起沿着萃取到光纤表面上，并通过在暴露的光纤芯表面上产生的倏逝波的吸收来检测。研究了用于离子缔合的CTA+浓度的影响，揭示了尿氨酸的吸光度随着CTA+浓度的增加而增加。清楚地观察到传感器响应的变化作为添加的尿氨酸浓度的函数。萃取数据进行了分析，使用分配平衡模型和Freundlich等温线。光纤倏逝场中的铀浓度比本体溶液中的铀浓度高54倍，铀的检测限（3σ）为1.3 nM。
Herein, we propose an evanescent-wave fiber optic sensing technique for the anionic dye uranine based on ion association extraction. The sensor was prepared by removing a section of the cladding from a multimode fiber and hydrophobization of the exposed core surface. Uranine was extracted in association along with hexadecyltrimethylammonium (CTA) ion onto the fiber surface and detected via absorption of the evanescent wave generated on the surface of the exposed fiber core. The effect of CTA+ concentration added for ion association was investigated, revealing that the absorbance of uranine increased with increasing CTA+ concentration. A change in the sensor response as a function of the added uranine concentration was clearly observed. The extraction data were analyzed using a distribution equilibrium model and a Freundlich isotherm. The uranine concentration in the evanescent field of the fiber optic was up to 54 times higher than that in the bulk solution, and the limit of detection (3σ) for uranine was found to be 1.3 nM.