Microencapsulated Photoluminescent Gold for ppb-Level Chromium(VI) Sensing

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dc.citation.firstpage17491en_US
dc.citation.issueNumber19en_US
dc.citation.journalTitleACS Applied Materials & Interfacesen_US
dc.citation.lastpage17500en_US
dc.citation.volumeNumber11en_US
dc.contributor.authorYin, Yiyuan B.en_US
dc.contributor.authorCoonrod, Christian L.en_US
dc.contributor.authorHeck, Kimberly N.en_US
dc.contributor.authorLejarza, Fernandoen_US
dc.contributor.authorWong, Michael S.en_US
dc.contributor.orgNanosystems Engineering Research Center for Nanotechnology-Enabled Water Treatmenten_US
dc.date.accessioned2019-08-28T15:02:59Zen_US
dc.date.available2019-08-28T15:02:59Zen_US
dc.date.issued2019en_US
dc.description.abstractLuminescent gold nanoclusters (Au NCs) are a promising probe material for selective chemical sensing. However, low luminescent intensity and an incomplete understanding of the mechanistic origin of the luminescence limit their practical implementation. We induced glutathione-capped Au NCs to aggregate within silica-coated microcapsular structures using polymer-salt aggregate self-assembly chemistry. The encapsulated NCs have a 5× luminescence enhancement compared to free Au NCs and can detect Cr(VI) at concentrations as low as 6 ppb (=0.12 μM CrO42-) through luminescence quenching, compared to free Au NCs, which have a limit of detection (LOD) of 52 ppb (=1 μM CrO42-). The LOD is 16× lower than the United States Environmental Protection Agency maximum contaminant level for total chromium (Cr(III) + Cr(VI), 100 ppb) in drinking water. No pH adjustment is needed using the encapsulated Au NCs, unlike the case for free Au NCs. The luminescent microcapsule material can sense Cr(VI) in simulated drinking water with a ∼20-30 ppb LOD, serving as a possible basis for a practical Cr(VI) sensor.en_US
dc.identifier.citationYin, Yiyuan B., Coonrod, Christian L., Heck, Kimberly N., et al.. "Microencapsulated Photoluminescent Gold for ppb-Level Chromium(VI) Sensing." <i>ACS Applied Materials & Interfaces,</i> 11, no. 19 (2019) American Chemical Society: 17491-17500. https://doi.org/10.1021/acsami.9b04699.en_US
dc.identifier.doihttps://doi.org/10.1021/acsami.9b04699en_US
dc.identifier.urihttps://hdl.handle.net/1911/107363en_US
dc.language.isoengen_US
dc.publisherAmerican Chemical Societyen_US
dc.rightsThis is an author's peer-reviewed final manuscript, as accepted by the publisher. The published article is copyrighted by the American Chemical Society.en_US
dc.subject.keywordaggregation-induced emissionen_US
dc.subject.keywordchromium(VI)en_US
dc.subject.keywordgold nanoclustersen_US
dc.subject.keywordluminescenceen_US
dc.subject.keywordnanoparticle-assembled capsulesen_US
dc.titleMicroencapsulated Photoluminescent Gold for ppb-Level Chromium(VI) Sensingen_US
dc.typeJournal articleen_US
dc.type.dcmiTexten_US
dc.type.publicationpost-printen_US
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