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1、NanoscaleROYALSOCIETYOFCHEMlSTRYPAPERViewArticleOnlineV沁WJournalVieuIssue册CheckforupdatesCitethis:Nanoscale,2020,12,16562WearableelectronicsforheatingandsensingbasedonamultifunctionalPET/silvernanowire/PDMSyarn+.5 Y b/8。N WULW co 人=已。Acn enuo,q POPEO300 OZOZAsf 6Z u。pws=qndZhonglin Yang,* Wenwen Wan
2、g,* Lili Bif Liangjun Chen, Guixin Wang, Guinan Chen, Cui Ye * and Jun Pan tStretchable and fl eible electronics built from multifunctional fi bres are essential for devices in humanmachine interactions, human motion monitoring and personal healthcare. However, the combination of stable heating and
3、precision sensing in a single conducting yarn has yet to be achieved. Herein, a yarn comprising poly(ethylene terephthalate) (PET), silver nano wires (AgNWs), and polydimethylsiloxane (PDMS) was designed and prepared. The PET/AgNW/PDMS yarn exhibited high electrical conductivity at 3 cm-1 and a larg
4、e tolerance to tensile strain up to 100% its own length. Only a negligible loss of electromechanical performance was observed after 1700 strain cycles. And an excellent response to applied strain was also achieved across a huge stretching range. The PET/AgNW/PDMS yarn displayed excellent heating per
5、formance and outstanding breathability when used in a heating fabric, and excellent sensitivity for monitoring both gross and fi ne movements in humans when used as a sensor.Received26thMay2020,Accepted29thJuly2020DOI:10.1039d0nr04023arsc.li/nanoscaleIntroductionFlexibleandstretchablematerialsareatt
6、ractiveforuseinartificialskin,orforbuildingdevicesusedindevelopinghumanmachineinteractions,monitoringhumanmotion,andpersonalhealthcare.-Electricallyconductingyarnshavebeenshowntodisplayremarkableperformancesinenergystorage,sensing,actuation,andCommUniCation.-12Recently,nanomaterialswithexcellentelec
7、tricalandmechanicalproperties,suchascarbonnanotubes,u,i4metalnanowires,is-uandgraphene,havebeenusedtodevelopelectricallyconductingyarns,butsilvernanowires(AgNWs)haveshownthemostpromisebecauseoftheirexcellentconductivityandstretchability.19-22Additionally,variousmethodsareappliedtofabricateAgNWsbased
8、conductingyarnsuchasspraycoating,dip-coating,laserscribing,andSPin-COating.23-26Amongthem,themostsimpleandcheapapproachistodepositAgNWsontoayarnsubstrate.Forpreparingcomfortableandeffectivedevicesfortrackinghumanmovementorprolongedstableheating;thewearableelectronicmustbebreathable,flexibleandstretc
9、hable.27-29MechanicaldeformationsuchasstretchingandbendingCollegeofMaterialsScienceandEngineering,ZhejiangUniversityofTechnology,Hangzhou310014,China.E-mail:panjun0123.ye0702tElectronicsupplementaryinformation(ESI)available.SeeDOI:10.1039/d0nr04023a，Equalcontributiontothisworkusuallydestroystheconne
10、ctivitybetweenconductingfibres,whichinitiallycausesinconsistenciesintheelectricalresistance(referredtoasresistance)throughoutthefabric,buteventuallyleadstodevicefailure.Long-termstabilityisthereforeanessentialresearchgoalfornewconductingyarns.Chengetal.developedaconductingfibrewithahierarchicalEcofl
11、ex-coatedcoppernanowire(CuNW)structure,whichwasusedinstable,stretchable,andwearableheatingdevices.30Liuetal.developedacarbonnanotube-basedfibrewithexcellentmechanicalandheatingproperties,whichcouldbestretchedrepeatedlyupto150%itsownlengthwithhighstabilityandreversibility.3iMeanwhile,multifunctionalw
12、earableelectronicsbasedonyarncomprisingAgNWswerealsoinvestigated.Zhaoetal.preparedapolymer-wrappedAgNWfibreforsimultaneousstrainsensingandheating,whichexhibitedarapid,reproducibleandstableresponseundertensilestrain(1-200%)andenabledhighheatingtemperatures.24Twokeyfactorsareusedtoevaluatetheefficienc
13、yofawearableheaterandstrainsensor:thestabilityofthetemperatureoutputduringdeformation,andthesensitivitytochangesintensilestrain.Toourknowledge,therearenoexamplesofasingleconductingyarnthatexhibitsbothhighlystableheatingandhighlysensitivesensingcapabilities.Mostofthereportedmultifunctionalyarnsexhibi
14、tedalowgaugefactor(GF),whichlimitedtheirsensitivitytofine,subtledeformation.Furthermore,thelongevityofthewearabledeviceswasshortsincetheconductivematerialsintheyarnwerepronetooxidationordetachment,whichmustbeovercomeforachievingwearabledeviceswithlong-termshelflifeandusage.5 Y b/8。N WULW co 人=已。Acn
15、enuo,q POPEO300 OZOZAsf 6Z u。pws=qndTherefore,thephysicalandchemicalstability;andthesensingperformanceofmultifunctionalyarnmustbeimprovedbeforetheycanbeusedinmarketable,wearableelectronicdevices.Toachievethis,wechoseaflexiblepoly(ethyleneterephthalate)(PET)rubbercore-spunthreadasasubstratefordeposit
16、edAgNWstoyieldaconductingyarn.TheAgNWswerethenprotectedfromoxidationanddetachmentbytheapplicationofinsulatingpolydimethylsiloxane(PDMS)layer,whichalsoservedtoimprovethestabilityoftheconductivepropertiesunderappliedmechanicaldeformation.FabricswovenfromthePET/AgNW/PDMSyarnwereusedtopreparemultifunctionalheatingandsensingmaterialwithhighstretchability,excellentheatingst
