Nanoporous photonic crystals with tailored surface chemistry for ionic copper sensing

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dc.contributor.authorEckstein,
dc.contributor.authorLaw, C.S.
dc.contributor.authorLim, S.Y.
dc.contributor.authorKaur, S.
dc.contributor.authorKumeria, T.
dc.contributor.authorFerré-Borrull, J.
dc.contributor.authorAbell, A.D.
dc.contributor.authorMarsal, L.F.
dc.contributor.authorSantos, A.
dc.date.issued2019
dc.description.abstractWe present a study on optical and surface chemistry engineering of nanoporous photonic crystals as sensing platforms for detection of ionic copper. The optical sensing system combines glutaraldehyde-crosslinked double-layered polyethyleneimine (PEI-GA-PEI)-functionalized nanoporous anodic alumina gradient-index filters (NAA-GIFs) with reflection spectroscopy for label-free, selective detection of ionic copper in water matrices. The spectral position of the photonic stopband (PSB) of PEI-GA-PEI-functionalized NAA-GIFs is tuned across the visible-NIR spectral region to assess the impact of this optical parameter on the sensing performance of the system. Spectral shifts in the characteristic PSB (ΔλPSB) of PEI-GA-PEI-functionalized NAA-GIFs upon exposure to analytical solutions of ionic copper are used as a sensing parameter. Shifts in ΔλPSB of these photonic crystals are monitored in real-time under dynamic flow conditions. Calibration of the sensing system with analytical solutions of ionic copper from 0.1 to 100 mM shows a dual sensing regime, at low (from 1 to 10 mM) and high (from 10 to 100 mM) concentrations, which is associated with conformational changes of the PEI-GA-PEI functional layer. The binding mechanism of Cu2+ in PEI-GA-PEI-modified NAA-GIFs follows a Freundlich isotherm model. The performance of the PEI-GA-PEI-NAA-GIFs for real-life applications is demonstrated using environmental water. The system shows excellent correlation in both environmental and analytical water solutions. This study provides new opportunities to engineer portable optical sensing systems with tailor-designed features to detect ionic copper for environmental applications.
dc.description.statementofresponsibilityChris Eckstein, Cheryl Suwen Law, Siew Yee Lim, Simarpreet Kaur, Tushar Kumeria, Josep Ferré-Borrull, Andrew D. Abell, Lluís F. Marsal and Abel Santos
dc.identifier.citationJournal of Materials Chemistry C, 2019; 7(39):12278-12289
dc.identifier.doi10.1039/c9tc04438h
dc.identifier.issn2050-7534
dc.identifier.issn2050-7526
dc.identifier.orcidLaw, C.S. [0000-0002-3276-8052]
dc.identifier.orcidLim, S.Y. [0000-0002-5677-9039]
dc.identifier.orcidAbell, A.D. [0000-0002-0604-2629]
dc.identifier.orcidSantos, A. [0000-0002-5081-5684]
dc.identifier.urihttp://hdl.handle.net/2440/122395
dc.language.isoen
dc.publisherRoyal Society of Chemistry
dc.relation.granthttp://purl.org/au-research/grants/arc/CE140100003
dc.relation.granthttp://purl.org/au-research/grants/nhmrc/GNT1143296
dc.rights© This journal is©The Royal Society of Chemistry 2019
dc.source.urihttps://doi.org/10.1039/c9tc04438h
dc.titleNanoporous photonic crystals with tailored surface chemistry for ionic copper sensing
dc.typeJournal article
pubs.publication-statusPublished

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