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Self-assembled porous polymer films for improved oxygen sensing

Salaris, Nikolaos; Haigh, Paul; Papakonstantinou, Ioannis; Tiwari, Manish K; (2023) Self-assembled porous polymer films for improved oxygen sensing. Sensors and Actuators B: Chemical , 374 , Article 132794. 10.1016/j.snb.2022.132794. Green open access

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Abstract

Absolute oxygen sensors based on quenching of phosphorescence have been the subject of numerous studies for the monitoring of biological environments. Here, we used simple fabrication techniques with readily available polymers to obtain high performance phosphorescent films. Specifically, evaporation-based phase separation and the breath figure technique were used to induce porosity. The pore sizes ranged from ∼ 37 nm to ∼ 141µm while the maximum average porosity achieved was ∼ 74%. The oxygen sensing properties were evaluated via a standarised calibration procedure with an optoelectronic setup in both transmission and reflection based configurations. When comparing non-porous and porous films, the highest improvements achieved were a factor of ∼ 7.9 in dynamic range and ∼ 7.3 in maximum sensitivity, followed by an improved linearity with a half-sensitivity point at 43% O2 V/V. Also, the recovery time was reduced by an order of magnitude in the high porosity film and all samples prepared were not affected by variations in the humidity of the surrounding environment. 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.

Type: Article
Title: Self-assembled porous polymer films for improved oxygen sensing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.snb.2022.132794
Publisher version: https://doi.org/10.1016/j.snb.2022.132794
Language: English
Additional information: © 2022 The Authors. This is an open access article under the CC BY 4.0 license Attribution 4.0 International (https://creativecommons.org/licenses/by/4.0/)
Keywords: Porous polymer films, Phase inversion and breath figure method, Phosphorescence based oxygen sensing, Improvement of sensing properties
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Mechanical Engineering
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10157305
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