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

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dc.contributor.authorLee, K.J.
dc.contributor.authorCapon, P.K.
dc.contributor.authorEbendorff-Heidepriem, H.
dc.contributor.authorKeenan, E.
dc.contributor.authorBrownfoot, F.C.
dc.contributor.authorSchartner, E.P.
dc.date.issued2023
dc.description.abstractOptical 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 response over the pH range 6.6 – 8.0, while the dynamic ranges of NIPAM-based sensors shifted to basic pH compared with AAm-based pH sensors. Furthermore, we found that an increased ratio of the backbone monomer, NIPAM, over the crosslinker, BIS, significantly shifted the working range to more basic pH values, covering a pH range of 8.1 – 10.3. Our results demonstrate that the polymer matrix can be a powerful means to control the indicator response of optical pH sensors.
dc.description.statementofresponsibilityKwang Jun Lee, Patrick K. Capon, Heike Ebendorff-Heidepriem, Emerson Keenan, Fiona Brownfoot, Erik P. Schartner
dc.identifier.citationSensors and Actuators B: Chemical: international journal devoted to research and development of physical and chemical transducers, 2023; 376(B):1-10
dc.identifier.doi10.1016/j.snb.2022.132999
dc.identifier.issn0925-4005
dc.identifier.issn0925-4005
dc.identifier.orcidLee, K.J. [0000-0003-3006-5094]
dc.identifier.orcidCapon, P.K. [0000-0002-7396-5757]
dc.identifier.orcidEbendorff-Heidepriem, H. [0000-0002-4877-7770]
dc.identifier.orcidSchartner, E.P. [0000-0003-1669-4302]
dc.identifier.urihttps://hdl.handle.net/2440/137628
dc.language.isoen
dc.publisherElsevier
dc.relation.granthttp://purl.org/au-research/grants/arc/CE140100003
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1159585
dc.relation.granthttp://purl.org/au-research/grants/arc/LP150100657
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1159585
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/1142636
dc.rights© 2022 Elsevier B.V. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.snb.2022.132999
dc.subjectdual emission ratiometric sensors
dc.subjectOptical pH sensors
dc.subjectpolymer matrix
dc.titleInfluence of the photopolymerization matrix on the indicator response of optical fiber pH sensors
dc.typeJournal article
pubs.publication-statusPublished

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