Novel optical oxygen sensing by phosphorescence quenching of palladium porphyrin self-assembled film on alumina plate

Abstract

<jats:p> An optical oxygen sensor based on the phosphorescence quenching of palladium tetrakis(4-carboxyphenyl)porphyrin (PdTCPP) self-assembled film (SAM) on alumina plate was developed. The phosphorescence intensity of PdTCPP film decreased with increasing oxygen pressure, indicating that the film can be used as an optical oxygen-sensing device based on phosphorescence quenching by oxygen. The ratio I<jats:sub>0</jats:sub>/I<jats:sub>100</jats:sub> as a sensitivity measure of the sensing film is estimated to be 17.7, showing that the film is a highly sensitive device for oxygen pressure. The film obeyed Stern–Volmer plots with a multisite model and possessed good operational stability and a fast response. Response times are 36 s for deoxygenated to oxygenated conditions and 148 s for the reverse conditions. </jats:p>

Temperature Compensation of Oxygen Sensing Films Utilizing a Dynamic Dual Lifetime Calculation Technique

“…These analytes were chosen because of their biological significance and due to the need for temperature compensation of oxygen sensitive luminophores [4-15]. Porphyrins are attractive for luminescent oxygen sensing due to their high sensitivity, large Stokes’ shift, good photostability, long lifetimes, and emission in the red to NIR wavelengths [36-44]. Platinum(II) octaethylporphyrin (PtOEP) was chosen because of its excitation and emission peaks close to 400 and 650 nm, respectively [8, 45].…”