Enhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranes

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dc.contributor.authorRuiz, Virginia
dc.contributor.authorPérez-Marquez, Ana
dc.contributor.authorMaudes, Jon
dc.contributor.authorGrande, Hans-Jürgen
dc.contributor.authorMurillo, Nieves
dc.contributor.institutionTecnalia Research & Innovation
dc.contributor.institutionPRINTEX
dc.date.issued2018-06-01
dc.descriptionPublisher Copyright: © 2018 Elsevier B.V.
dc.description.abstractWe report a method to encapsulate graphene quantum dots (GQD) in polyacrylonitrile (PAN) nanofibrous membranes to manufacture robust filtering membranes by electrospinning. GQD-PAN membranes with different nanofiber diameter were prepared tuning the electrospinning parameters, all exhibiting the characteristic fluorescence fingerprint of the GQD probes. The photoluminescence (PL) stability of GQD embedded in the PAN fibers was significantly enhanced with respect to that of water dispersed GQD luminescent probes. The PL of GQD-PAN filtering membranes showed remarkable time stability, both stored dry and immersed in phosphate buffer solutions (PBS), as well as exposed to continuous light irradiation. However, the PL intensity of GQD-PAN membranes was irreversibly quenched by highly oxidant free chlorine solutions. Thus, electrospun GQD-PAN membranes exhibited excellent performance as turn-off fluorescence sensing platforms for free chlorine detection in PBS 0.1 M pH 7. The analytical performance of GQD-PAN membranes was comparable to that of GQD solutions with optimal concentrations, displaying a fast (no need of incubation time) and linear response to chlorine concentration in the 10–600 μM range, a low detection limit of 2 μM, high sensitivity, reproducibility and selectivity. Moreover, the sensing performance of the membranes was very stable after being immersed in PBS for months, outperforming the stability of GQD solutions.en
dc.description.statusPeer reviewed
dc.format.extent11
dc.format.extent1414443
dc.identifier.citationRuiz , V , Pérez-Marquez , A , Maudes , J , Grande , H-J & Murillo , N 2018 , ' Enhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranes ' , Sensors and Actuators B: Chemical , vol. 262 , pp. 902-912 . https://doi.org/10.1016/j.snb.2018.02.081
dc.identifier.doi10.1016/j.snb.2018.02.081
dc.identifier.issn0925-4005
dc.identifier.otherresearchoutputwizard: 11556/501
dc.identifier.urlhttp://www.scopus.com/inward/record.url?scp=85042177157&partnerID=8YFLogxK
dc.language.isoeng
dc.relation.ispartofSensors and Actuators B: Chemical
dc.rightsinfo:eu-repo/semantics/restrictedAccess
dc.subject.keywordsGraphene quantum dots
dc.subject.keywordsNanofibers
dc.subject.keywordsMembranes
dc.subject.keywordsElectrospinning
dc.subject.keywordsFluorescence sensor
dc.subject.keywordsChlorine detection
dc.subject.keywordsGraphene quantum dots
dc.subject.keywordsNanofibers
dc.subject.keywordsMembranes
dc.subject.keywordsElectrospinning
dc.subject.keywordsFluorescence sensor
dc.subject.keywordsChlorine detection
dc.subject.keywordsElectronic, Optical and Magnetic Materials
dc.subject.keywordsInstrumentation
dc.subject.keywordsCondensed Matter Physics
dc.subject.keywordsSurfaces, Coatings and Films
dc.subject.keywordsMetals and Alloys
dc.subject.keywordsElectrical and Electronic Engineering
dc.subject.keywordsMaterials Chemistry
dc.titleEnhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranesen
dc.typejournal article
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