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dc.contributor.authorTsai, Evaline Sen
dc.contributor.authorHimmelstoß, Sandy Fen
dc.contributor.authorWiesholler, Lisa Men
dc.contributor.authorHirsch, Thomasen
dc.contributor.authorHall, Lisaen
dc.date.accessioned2019-08-09T23:30:19Z
dc.date.available2019-08-09T23:30:19Z
dc.date.issued2019-09en
dc.identifier.issn0003-2654
dc.identifier.urihttps://www.repository.cam.ac.uk/handle/1810/295615
dc.description.abstractUpconversion nanoparticles (UCNPs) can provide a vehicle for chemical imaging by coupling chemically sensitive dyes and quenchers. The mechanism for coupling of two anthraquinone dyes, Calcium Red and Alizarin Red S, was investigated as a function of pH. The green emission band of the UCNPs was quenched by a pH-dependent inner filter effect (IFE) while the red emission band remained unchanged and acted as the reference signal for ratiometric pH measurements. Contrary to previous expectation, there was little evidence for a resonance energy transfer (RET) mechanism even when the anthraquinones were attached onto the UCNPs through electrostatic attraction. Since the UCNPs are point emitters, only emitters close to the surface of the UCNP are within the expected Förster distance and UC-RET is <10%. The theoretical and experimental analysis of the interaction between UCNPs and pH-sensitive quenchers will allow the design of UCNP pH sensors for determination of pH via IFE.
dc.description.sponsorshipThis work was supported by the EPSRC Cambridge NanoDTC, EP/L015978/1
dc.format.mediumPrinten
dc.languageengen
dc.publisherRoyal Society of Chemistry
dc.rightsAll rights reserved
dc.rights.uri
dc.titleUpconversion nanoparticles for sensing pH.en
dc.typeArticle
prism.endingPage5557
prism.issueIdentifier18en
prism.publicationDate2019en
prism.publicationNameThe Analysten
prism.startingPage5547
prism.volume144en
dc.identifier.doi10.17863/CAM.42664
dcterms.dateAccepted2019-08-07en
rioxxterms.versionofrecord10.1039/c9an00236gen
rioxxterms.versionAM
rioxxterms.licenseref.urihttp://www.rioxx.net/licenses/all-rights-reserveden
rioxxterms.licenseref.startdate2019-09en
dc.contributor.orcidHirsch, Thomas [0000-0002-4224-4762]
dc.contributor.orcidHall, Lisa [0000-0001-9572-9854]
dc.identifier.eissn1364-5528
rioxxterms.typeJournal Article/Reviewen
pubs.funder-project-idEPSRC (EP/L015978/1)
cam.orpheus.successThu Jan 30 10:41:58 GMT 2020 - Embargo updated*
rioxxterms.freetoread.startdate2020-09-30


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