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dc.contributor.authorColeman, Jonathan
dc.contributor.authorBiccai, Sonia
dc.contributor.authorBoland, Connor
dc.contributor.authorO'Driscoll, Daniel
dc.contributor.authorHarvey, Andrew
dc.contributor.authorGabbett, Cian
dc.contributor.authorO'Suilleabhain, Domhnall
dc.contributor.authorGriffin, Aideen
dc.contributor.authorLi, Zheling
dc.contributor.authorYoung, Robert
dc.date.accessioned2019-09-26T11:50:44Z
dc.date.available2019-09-26T11:50:44Z
dc.date.issued2019
dc.date.submitted2019en
dc.identifier.citationBiccai, S., Boland, C., O'Driscoll, D., Harvey, A., Gabbett, C., O Suilleabhain, D., Griffin, A., Li, Z., Young, R., & Coleman, J. Negative Gauge Factor Piezoresistive Composites Based on Polymers Filled with MoS2 Nanosheets, ACSNano, 13, 2019, 6845 - 6855en
dc.identifier.otherY
dc.descriptionPUBLISHEDen
dc.description.abstractNanocomposite strain sensors, particularly those consisting of polymer–graphene composites, are increasingly common and are of great interest in the area of wearable sensors. In such sensors, application of strain yields an increase in resistance due to the effect of deformation on interparticle junctions. Typically, widening of interparticle separation is thought to increase the junction resistance by reducing the probability of tunnelling between conducting particles. However, an alternative approach would be to use piezoresistive fillers, where an applied strain modifies the intrinsic filler resistance and so the overall composite resistance. Such an approach would broaden sensing capabilities, as using negative piezoresistive fillers could yield strain-induced resistance reductions rather than the usual resistance increases. Here, we introduce nanocomposites based on polyethylene oxide (PEO) filled with MoS2 nanosheets. Doping of the MoS2 by the PEO yields nanocomposites which are conductive enough to act as sensors, while efficient stress transfer leads to nanosheet deformation in response to an external strain. The intrinsic negative piezoresistance of the MoS2 leads to a reduction of the composite resistance on the application of small tensile strains. However, at higher strain the resistance grows due to increases in junction resistance. MoS2–PEO composite gauge factors are approximately −25 but fall to −12 for WS2–PEO composites and roughly −2 for PEO filled with MoSe2 or WSe2. We develop a simple model, which describes all these observations. Finally, we show that these composites can be used as dynamic strain sensors.en
dc.format.extent6845en
dc.format.extent6855en
dc.language.isoenen
dc.relation.ispartofseriesACSNano;
dc.relation.ispartofseries13;
dc.rightsYen
dc.subjectLiquid-phase exfoliationen
dc.subjectTransition-metal dichalcogenideen
dc.subjectGrapheneen
dc.subject2-dimensionalen
dc.subjectStrain gaugeen
dc.titleNegative Gauge Factor Piezoresistive Composites Based on Polymers Filled with MoS2 Nanosheetsen
dc.typeJournal Articleen
dc.type.supercollectionscholarly_publicationsen
dc.type.supercollectionrefereed_publicationsen
dc.identifier.peoplefinderurlhttp://people.tcd.ie/colemaj
dc.identifier.rssinternalid207212
dc.identifier.doihttp://dx.doi.org/10.1021/acsnano.9b01613
dc.relation.ecprojectidinfo:eu-repo/grantAgreement/EC/FP7/785219
dc.rights.ecaccessrightsopenAccess
dc.subject.TCDThemeNanoscience & Materialsen
dc.identifier.orcid_id0000-0001-9659-9721
dc.contributor.sponsorScience Foundation Ireland (SFI)en
dc.contributor.sponsorGrantNumberSFI/12/RC/2278en
dc.contributor.sponsorEuropean Union (EU)en
dc.contributor.sponsorGrantNumber785219en
dc.identifier.urihttps://pubs.acs.org/doi/10.1021/acsnano.9b01613
dc.identifier.urihttp://hdl.handle.net/2262/89561


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