Novel optical oxygen sensing material: platinum porphyrin-styrene-pentafluorostyrene copolymer film

A new fluoropolymer, poly(styrene-co-pentafluorostyrene) [copoly(styrene/PFS)], is synthesized and applied to the matrix of optical oxygen sensing using phosphorescence quenching of platinum octaethylporphyrin (PtOEP) by oxygen. The phosphorescence intensity of PtOEP-poly(styrene-co-PFS) film decreased with increase of oxygen concentration. The ratio I-0/I-100 is used to describe the sensitivity of the sensing film, where I-0 and I-100 represent the detected phosphorescence intensities from a film exposed to 100% argon and 100% oxygen, respectively. The I-0/I-100 of PtOEP-poly(styrene-co-PFS) film is estimated to be 18.0 and a large Stern-Volmer constant is obtained compared with PtOEP-polystyrene film (I-0/I-100=4.5). The response times of PtOEP-poly(styrene-co-PFS) film are 5.66 s on going from argon to oxygen and 30.0 s from oxygen to argon. This result indicates that PtOEP-copoly(styrene/PFS) film is a highly sensitive device for oxygen.