Influence of the photopolymerization matrix on the indicator response of optical fiber pH sensors

KJ Lee; PK Capon; H Ebendorff-Heidepriem; E Keenan; F Brownfoot; EP Schartner

Journal article

Influence of the photopolymerization matrix on the indicator response of optical fiber pH sensors

KJ Lee, PK Capon, H Ebendorff-Heidepriem, E Keenan, F Brownfoot, EP Schartner

Sensors and Actuators B Chemical | Published : 2023

DOI: 10.1016/j.snb.2022.132999

Abstract

Optical fiber pH sensors work by observing a change in the indicator's optical signal caused by variations in pH and these indicators can be immobilized onto the surface of an optical fiber using a polymer matrix. How the composition of the polymer matrix changes pH detection range using the indicator (5(6)-carboxynaphthofluorescein (CNF)) has not been studied. Here we show that the composition of the polymer matrix affects the working pH ranges of optical fiber CNF sensors. We used acrylamide (AAm) or N-isopropylacrylamide (NIPAM) as the backbone monomer, and N, N’-methylenebisacrylamide (BIS) as the crosslinker for the polymer matrix. We found that AAm-based pH sensors showed rapid respons..

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University of Melbourne Researchers

Emerson Keenan Author

Fiona Brownfoot Author

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Grants

Awarded by Air Force Office of Scientific Research

Funding Acknowledgements

The authors acknowledge support from the ARC Centre of Excellence for Nanoscale Biophotonics (CE140100003) , and NHMRC Project Grant (APP1159585) . EPS is supported by ARC Linkage Grant (LP150100657) , NHMRC Ideas Grant (APP1159585) , and AFOSR Grant (FA9550-20- 1-0160) . EK is supported by an Early Career Research Fellowship in the Department of Obstetrics and Gynaecology at the University of Melbourne. FB is supported by a NHMRC Early Career Fellowship (#1142636) and a Norman Beischer Medical Research Foundation Fellowship. PKC acknowledges PhD scholarship support from the MF and MH Joyner Scholarship in Science and the Norman and Patricia Polglase Supplementary Scholarship. This work was performed in part at the Optofab node of the Australian National Fabrication Facility utilizing Commonwealth and SA State Government funding.