In this study, PtOEP/poly(p-FSt-co-TFEMA) fluoropolymer film based on the dynamic fluorescence quenching mechanism was prepared by embedded platinum octaethylporphyrin (PtOEP) in poly (p-fluorostyrene-co-trifluoroethyl methacrylate) (poly(p-FSt-co-TFEMA)) film via solvent evaporation method. The oxygen-sensing properties, including the sensitivity, fluorescence intensity, and photo-stability, were evaluated based on variable indicator concentration and film thickness. The optimal parameters were determined through a series of parallel experiments. Results indicate a film thickness of 16 μm and an optimal PtOEP concentration of 1.0 mM. Under optimal conditions, the PtOEP/poly(p-FSt-co-TFEMA) fluoropolymer film exhibited an adequate signal-to noise ratio, high oxygen sensitivity and satisfactory anti-photo-bleaching ability.
Ke Zhang,Honglin Zhang,Ying Wang,Yanqing Tian,Jiupeng Zhao,Yao Li
Fluorinated acrylate polymer has received great interest in recent years due to its extraordinary characteristics such as high oxygen permeability, good stability, low surface energy and refractive index . In this work, platinum octaethylporphyrin/poly(methylmethacrylate- co -trifluoroethyl methacrylate) (PtOEP/poly(MMA- co -TFEMA)) oxygen sensing film was prepared by the immobilizing of PtOEP in a poly(MMA- co -TFEMA) matrix and the technological readiness of optical properties was established based on the principle of luminescence quenching . It was found that the oxygen-sensing performance could be improved by optimizing the monomer ratio (MMA/TFEMA = 1:1), tributylphosphate(TBP, 0.05 mL) and PtOEP (5 μg) content. Under this condition, the maximum quenching ratio I 0 /I 100 of the oxygen sensing film is obtained to be about 8.16, Stern-Volmer equation is I 0 /I = 1.003 + 2.663[O 2 ] (R 2 = 0.999), exhibiting a linear relationship, good photo-stability, high sensitivity and accuracy. Finally, the synthesized PtOEP/poly(MMA- co -TFEMA) sensing film was used for DO detection in different water samples.
HighlightsA FRET system (FITC-PtOEP) was integrated into a photonic crystal film for oxygen sensing.Imidazole modification boosted fluorescence intensity by 52.4% under 100% O2atmosphere.Imidazole also provided excellent photostability with a 99.77% fluorescence retention rate.Fluorescence resonance energy transfer (FRET) was implemented in a photonic crystal-structured oxygen sensing film by incorporating fluorescein isothiocyanate (FITC) with platinum octaethylporphyrin (PtOEP). The highest Stern-Volmer quenching constant (KSV= 20.20 ± 0.25) and maximum quenching ratio (21.81 ± 0.21) were achieved at a PtOEP:FITC molar ratio of 1:1. Compared to the control, theKSVand maximum quenching ratio increased by 56.8% and 48.4%, respectively. Additionally, imidazole was introduced into the oxygen-sensing film via a casting method. The results demonstrated that imidazole effectively modulates the energy transfer efficiency between oxygen molecules and PtOEP. Under 20% O2and 100% O2atmospheres, the fluorescence intensity of the imidazole-modified film increased by 18.4% and 52.4%, respectively. Furthermore, imidazole provided excellent protection for PtOEP, yielding a fluorescence retention rate of 99.77% ± 0.18%.
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