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1、SensorsandActuatorsB161(2012)967–972ContentslistsavailableatSciVerseScienceDirectSensorsandActuatorsB:Chemicaljournalhomepage:www.elsevier.com/locate/snbPolyanilinenanofiberhumiditysensorpreparedbyelectrospinningQianqianLin,Yang∗Li,MujieYangDepartmentofPolymerScie
2、nceandEngineering,ZhejiangUniversity,KeyLaboratoryofMacromoleculeSynthesisandFunctionalization,MinistryofEducation,Hangzhou310027,ChinaarticleinfoabstractArticlehistory:Polyaniline(PANi)nanofiberhumiditysensorswerepreparedbyelectrospinning(ES)fromtheReceived19Sept
3、ember2011N,N-dimethylformamidesolutionofPANi,poly(vinylbutyral)(PVB)andpoly(ethyleneoxide)(PEO).ReceivedinrevisedformMorphologiesoftheelectrospunnanofiberspreparedunderdifferentESconditionswereobservedby22November2011scanningelectronmicroscopy.Formationofbeadsinth
4、enanofiberswasfoundtogreatlyaffecttheirAccepted29November2011adhesionAvailableonline7December2011tothesubstratesandthenanostructures.BymodulatingthecompositionofESsolution,PANinanofiberswithbeadsnotonlyshowedgoodadhesiontotheelectrodeandthusgoodelectricalcontact,bu
5、tKeywords:alsomaintainedrelativelyhighspecificsurfacearea.Furthermore,hydrophilicityofthenanofiberswasElectrospinningmodifiedbyadjustingtheratioofPVBtoPEOintheESsolution,whichhadaneffectontheirsensingproperties.PolyanilineHumidityresponseofthenanofibersensorswasinves
6、tigatedbymeasuringtheirimpedanceatNanofiberdifferenthumiditylevelsatroomtemperature.Thenanofibersensorsrevealedmuchhighersensitivitythantheirfilmcounterparts(impedancechangingforthreeordersofmagnitudefrom20%to90%RH).InHumiditysensorHumiditysensingpropertiesaddition,
7、theywerefeaturedwithgoodsensinglinearity,fastresponse(t90%of∼8sand6sforadsorptionanddesorption,respectively),smallhysteresis(∼1%RH)andgoodrepeatability.©2011ElsevierB.V.Allrightsreserved.1.Introductionnanosensorwasreportedtoexhibitsatisfyingsensingproperties.Insi
8、tupolymerizationofaniline,pyrrole,etc.onthesurfaceofelec-Withtheacceleratingdevelopmentofnanoscienceandnano-trospunnanofibersdepositedonthesubstratesalsoimprove
