Absolute oxygen sensors based on quenching of phosphorescence have been the subject of numerous studies for the monitoring of biological environments. Here, we exploited self-assembly based fabrication of porous polymer films to encapsulate the phosphorescent dye onto four different types of porous films. Specifically, evaporation-based phase separation and the breath figure technique were used to induce porosity. The oxygen sensing properties were evaluated via a standardized calibration procedure with an optoelectronic setup in both transmission and reflection based configurations. We have also undertaken a thorough characterisation of the film porosities using an optical microscope, a scanning electron microscope and microCT imaging. Despite the use of common polymers, the fabrication techniques employed led to the significant enhancement of oxygen sensing properties and elucidated the relation between porous film morphologies and sensing performance.
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