Platinum tetrakis(pentafluorophenyl)porphyrin immobilized in polytrifluoroethylmethacrylate film as a photostable optical oxygen detection material

Abstract

An optical oxygen detection material based on platinum tetrakis(pentafluorophenyl)porphyrin (PtTFPP) immobilized in fluoropolymer, polytrifluoroethylmethacrylate (poly-TFEM) film has been developed and characterized. The luminescence intensity of PtTFPP in poly-TFEM film decreased with increase of oxygen concentration. The ratio I 0/ I 100 is used as a sensitivity of the film, where I 0 and I 100 represent the detected luminescence intensities from a film exposed to 100% argon and 100% oxygen, respectively. I 0/ I 100 value of PtTFPP in poly-TFEM film is estimated to be 15.4 and large Stern–Volmer constant is obtained compared with PtTFPP in polystyrene film. The response times of PtTFPP immobilized in poly-TFEM film are 5.6 s on going from argon to oxygen and 32 s from oxygen to argon, respectively. The fast response time is obtained using PtTFPP immobilized in poly-TFEM film. PtTFPP in poly-TFEM film exhibits minimal deterioration decrease of initial intensity after continuous irradiation for 24 h (ca. 0.5%). These results indicate that PtTFPP immobilized in poly-TFEM film is photostable and highly sensitive device for oxygen.