Integrative approach to fluorescence-based oxygen sensing in polymer optical fibers with surface plasmon resonance

• Published in: SENSORS AND ACTUATORS A-PHYSICAL
• Main Authors: Hishamuddin, Azween Hadiera; Zoolfakar, Ahmad Sabirin; Azeman, Nur Hidayah; Bakar, Mohd Hafiz Abu; Abdullah, Fairuz; Daniyal, Wan Mohd Ebtisyam Mustaqim Mohd; Bakar, Ahmad Ashrif A.; Zolkapli, Maizatul
• Format: Article
• Language: English
• Published: ELSEVIER SCIENCE SA 2024
• Subjects: Engineering; Instruments & Instrumentation
• Online Access: https://www-webofscience-com.uitm.idm.oclc.org/wos/woscc/full-record/WOS:001347487200001
• ISSN: 0924-4247; 1873-3069
• DOI: 10.1016/j.sna.2024.115979

This study demonstrates a technique to enhance oxygen (O2) concentration measurement by combining surface plasmon resonance (SPR) and fluorescence-based sensor on polymer optical fiber (POF). The SPR was generated using silver (Ag) and the fluorescence was generated by organic dye. Three fluorescence dyes were used, Tris (4, 7-diphenyl-1, 10-phenanthroline) ruthenium (II) dichloride ([Ru(dpp)3]2+), platinum octaethylporphyrin (PtOEP) and 5,10,15,20-tetrakis (pentafluorophenyl) 21 H,23H-porphine palladium (II) (PdTFPP). The sensor was tested in a gas chamber with different concentration level of O2. Sensitivity values for the fluorescence dyes for [Ru(dpp)3]2*, PtOEP, and PdTFPP were 0.0099 a.u/%, 0.0343 a.u/% and 0.05 a.u/% respectively. When SPR was implemented, the sensitivity values for Ag/[Ru(dpp)3]2*, Ag/PtOEP, and Ag/PdTFPP were 0.0589 nm/%, 0.0345 nm/%, and 0.118 nm/% respectively. PdTFPP and Ag/PdTFPP exhibit highest sensitivity in each experiment. Therefore, the further analysis for the sensing performance of PdTFPP and Ag/PdTFPP were held. As a result, Ag/PdTFPP exhibits lower limit of detection (LOD), and limit of quantification (LOQ) with 3.054 % and 9.254 %, respectively, with higher R2 of 0.9971 and lower mean standard deviation of 0.174, compared to PdTFPP 16.496% and 49.988 % respectively, with R2 of 0.9211 and higher mean standard deviation of 2.003. This improvement can benefit researchers and professionals in medical diagnostics, environmental monitoring, and industrial process control by providing a more sensitive and accurate method for measuring O2 levels.