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.