桑色素-Al掺杂的溶胶-凝胶薄膜修饰的MPOF光纤氟离子传感探头

本文通过对微结构聚合物光纤修饰桑色素-铝配合物掺杂的凝胶薄膜，制备了一种氟化物光纤传感探头。这种探头的结构基于微结构聚合物光纤实现，其内部具有贯穿的微孔道结构，这种微孔结构可以作为敏感材料的载体以及微传感池。敏感层的修饰通过溶胶-凝胶过程实现，将掺有桑色素-铝的溶胶直接吸入光纤内部，可以在光纤微孔阵列中形成凝胶敏感膜。微结构光纤内部可以容纳微量液体，传感过程在微孔道内进行。传感原理基于荧光淬灭远离实现，氟离子对凝胶膜中桑色素-铝具有强烈的荧光淬灭作用，因此传感探头对于不同浓度的氟离子溶液表现不同的荧光强度。在pH值为4.6的条件下，探头对于氟离子具有良好的响应，其传感范围为5-50mmol/L。

A fluoride sensitive optical probe based on Sol-gel matrix modified microstructured optical fibre

In this article, we fabricated an optical fluoride probe based on microstructured polymer optical fibers (MPOFs) which is modified with morin-Al complex doped silica gel film. The structure of this probe is based on microstructured polymer optical fiber. There are microholes in the optical fiber. These microholes could be used as the substrate of sensing materials and minor reaction pool. The deposition of sensing layer was realized by sol-gel process. When the sol doped with morin-Al was inhaled into the optical fiber, sensing layer formed on the inner wall. Trace liquid could be hold in the MPOF, and the process of sensing are carried out in the microholes of MPOF. The sensing process was based on fluorescence process. Fluoride quenched the fluorescence of morin-Al in gel matrix when it reacted with it. Then the sensing probe showed different fluorescence intensity to different fluoride ion concentrations in the aqueous solution. The range of response was 5-50 mmol/L, under the condition of pH=4.6.