High sensitivity and accuracy dissolved oxygen (DO) detection by using PtOEP/poly(MMA-co-TFEMA) sensing film

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.