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1、AnalyticaChimicaActa748(2012)73–80ContentslistsavailableatSciVerseScienceDirectAnalyticaChimicaActajournalhomepage:www.elsevier.com/locate/acaHighlysensitiveandultrafastresponsesurfaceacousticwavehumiditysensorbasedonelectrospunpolyaniline/poly(vinylbutyral)nano?bersQianqian?Lin,YangLi,MujieYangDe
2、partmentofPolymerScienceandEngineering,CyrusTangCenterforSensorMaterialsandApplications,ZhejiangUniversity,MOEKeyLaboratoryofMacromoleculeSynthesisandFunctionalization,Hangzhou310027,ChinahighlightsgraphicalabstractPolyanline/poly(vinylbutyral)nano?bersarepreparedbyelectrospinning.Nano?ber-based
3、SAWhumiditysen-sorshowhighsensitivityandultra-fastresponse.TheSAWsensorcandetectverylowhumidity.articleinfoabstractArticlehistory:Polyaniline(PANi)compositenano?bersweredepositedonsurfaceacousticwave(SAW)resonatorwithReceived18January2012acentralfrequencyof433MHztoconstructhumiditysensors.Electro
4、spunnano?bersofpoly(methylReceivedinrevisedform8July2012methacrylate),poly(vinylpyrrolidone),poly(ethyleneoxide),poly(vinylidene?uoride),poly(vinylAccepted23August2012butyral)Availableonline30August2012(PVB)werecharacterizedbyscanningelectronmicroscopy,andhumidityresponseofcorre-spondingSAWhumidit
5、ysensorswereinvestigated.TheresultsindicatedthatPVBwassuitableasamatrixKeywords:toformnano?berswithPANibyelectrospinning(ES).ElectrospunPANi/PVBnano?bersexhib-itedacore–sheathstructureasrevealedbytransmittanceelectronmicroscopy.EffectsofEScollectionSurfaceacousticwavetimeonhumidityresponseofSAWsen
6、sorbasedonPANi/PVBnano?berswereexaminedatroomtem-Polyanilineperature.ElectrospinningThecompositenano?bersensorexhibitedveryhighsensitivityof～75kHz/%RHfrom20to90%RH,ultrafastresponse(1sand2sforhumidi?cationanddesiccation,respectively)andgoodsensingHumiditysensorlinearity.Furthermore,thesensorcouldd
7、etecthumidityaslowas0.5%RH,suggestingitspotentialsforCompositenano?berslowhumiditydetection.Attemptsweredonetoexplaintheattractivehumiditysensingperformanceofthesensorbyconsideringconductivity,hydrophilicity,visc
