Novel optical oxygen sensing material: Platinum porphyrin-fluoropolymer film

New fluoropolymers, poly(isobutylmethacrylate-co-trifluoroethylmethacrylate) (poly-IBM-co-TFEM) and poly(styrene-co-trifluoroethylmethacrylate) (poly-styrene-co-TFEM) are synthesized and applied to the matrix of optical oxygen pressure sensing based on phosphorescence quenching of platinum porphyrin, platinum octaethylporphyrin (PtOEP), by oxygen. The I₀/I₁₀₀, as a sensitivity of the sensing film, where I₀ and I₁₀₀ represent the detected phosphorescence intensities from a film exposed to 100% argon and 100% oxygen, respectively, of PtOEP-poly-IBM film and polystyrene film, as the reference, are estimated to be 69.0 and 4.5, respectively. However, the I₀/I₁₀₀ of poly-IBM-co-TFEM film and poly-styrene-co-TFEM film are estimated to be 288 and 296, respectively, and large Stern-Volmer constants are obtained. This result indicates that PtOEP-fluoropolymer films are highly sensitive devices for oxygen. For PtOEP-poly-IBM-co-TFEM film, response times are 6.0 sec for deoxygenated to oxygenated conditions and 35.1 sec for reverse conditions. For PtOEP-poly-styrene-co-TFEM film, however, response times are 4.4 sec for deoxygenated to oxygenated conditions and 30.2 sec for reverse conditions. The rapid response for switching between oxygenated and deoxygenated condition is accomplished using PtOEP-fluoropolymer film.