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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.date.accessioned2018-03-02T11:15:32Z
dc.date.available2018-03-02T11:15:32Z
dc.date.issued2018-06-01
dc.identifier.citationRuiz, Virginia, Ana Pérez-Marquez, Jon Maudes, Hans-Jürgen Grande, and Nieves Murillo. “Enhanced Photostability and Sensing Performance of Graphene Quantum Dots Encapsulated in Electrospun Polyacrylonitrile Nanofibrous Filtering Membranes.” Sensors and Actuators B: Chemical 262 (June 2018): 902–912. doi:10.1016/j.snb.2018.02.081.en
dc.identifier.issn0925-4005en
dc.identifier.urihttp://hdl.handle.net/11556/501
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.language.isoengen
dc.publisherElsevier B.V.en
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.titleEnhanced photostability and sensing performance of graphene quantum dots encapsulated in electrospun polyacrylonitrile nanofibrous filtering membranesen
dc.typearticleen
dc.identifier.doi10.1016/j.snb.2018.02.081en
dc.rights.accessRightsembargoedAccessen
dc.subject.keywordsGraphene quantum dotsen
dc.subject.keywordsNanofibersen
dc.subject.keywordsMembranesen
dc.subject.keywordsElectrospinningen
dc.subject.keywordsFluorescence sensoren
dc.subject.keywordsChlorine detectionen
dc.journal.titleSensors and Actuators B: Chemicalen
dc.page.final912en
dc.page.initial902en
dc.volume.number262en


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