Ms. Yoshimi Kosugi Profile

Yoshimi Kosugi

at Soka Univ

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Proceedings Article | 5 March 2022 Poster + Presentation + Paper

Evaluation of hetero-core fiber SPR sensor with different ionic liquid gel coatings for CO2 detection

Yoshimi Kosugi, Michiko Nishiyama, Kazuhiro Watanabe, Junichi Ida

Proceedings Volume 12008, 120080X (2022) https://doi.org/10.1117/12.2613414

KEYWORDS: Sensors, Carbon monoxide, Fiber optics sensors, Optical coatings, Optical fibers, Liquids, Gold, Fiber optics, Refractive index, Scanning electron microscopy

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We have proposed and developed a CO₂ sensor by coating hetero-core optical fiber surface plasmon resonance (SPR) sensors with ionic liquid (IL) gel coating. The hetero-core optical fiber has no electrical contact in the sensor portion as a feature of the optical fiber. In our previous study, it was confirmed that the proposed hetero-core fiber CO₂ sensor using 1-ethyl-3-methylimidazolium tetrafluoroborate ([EMIM][BF₄]) as an IL can successfully detect CO₂ gas. However, so far, ILs other than [EMIM][BF4] for the sensor has not been tested yet. Since it is known that the CO₂ solubility in ILs changes by changing cations and/or anions, CO₂ sensing characteristics of the proposed sensor could be affected by the used IL. In the present paper, we examined how the change in cation and/or anion in the IL affects the CO₂ sensing characteristics of the proposed sensor using four different ILs. 1-butyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide ([BMIM][Tf₂N]), 1-butyl-3-methylimidazolium trifluoroacetate ([BMIM][TFA]), 1- butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF₆]), and 1-butyl-3-methylimidazolium tetrafluoroborate ([BMIM][BF₄]), having different CO₂ solubility in descending order. By measuring the transmitted spectra and, optical loss change, we evaluated the sensitivity and responsiveness of the fabricated CO₂ sensors. The results showed that for all four IL coatings, the SPR spectra was observed using the fabricated sensors. Further, All the CO₂ sensors with different ILs showed response to CO₂ gas. Especially, the sensor prepared using the IL of [BMIM][TFA] exhibited the highest optical loss change in response to CO₂ concentration change.

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