high performance ethanol sensing films fabricated from zno and in2o3 nanofibers

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1、AppliedSurfaceScience258(2012)6643–6647ContentslistsavailableatSciVerseScienceDirectAppliedSurfaceSciencejournalhomepage:www.elsevier.com/locate/apsuscHighperformanceethanolsensingfilmsfabricatedfromZnOandIn2O3nanofiberswithadouble-layerstructureXiao-Juana,ba,∗Zhang,Guan-JunQiaoaStateKeyL

2、aboratoryforMechanicalBehaviorofMaterials,XianJiaotongUniversity,Xian710049,PRChinabSchoolofScience,XianPolytechnicUniversity,Xian710048,PRChinaarticleinfoabstractArticlehistory:ZnOandInOnanofibers23aresynthesizedviaelectrospinningmethods,andcharacterizedbyX-rayReceived27June2011diffract

3、ion(XRD),scanningelectronmicroscopy(SEM),transmissionelectronmicroscope(TEM),infraredReceivedinrevisedform16March2012(IR)spectroscopy,andX-rayphotoelectronspectroscopy(XPS).Thenanofibersaredepositedonceramic19March2012AcceptedsubstratesAvailableonline28March2012toformsensingfilmswithvarious

4、structures(ZnOnanofiberfilms,ZnO–In2O3nanofiberfilms,andZnO–In2O3–ZnOnanofiberfilms),andtheirsensingpropertiesareinvestigatedatdifferenttempera-tures.Keywords:ComparedwithZnOnanofiberfilmsandZnO–In2O3–ZnOnanofiberfilms,theobtainedZnO–In2O3nanofiberfilmsexhibitimprovedandexcellentsensingpropertiestoet

5、hanol.Thehighestsensitivity(theSemiconductorsratioSensitivityofsensorresistanceinairtothatintargetambience)of25isobtainedwhentheZnO–In2O3filmsareexposedto100ppmethanolat210◦C,whilethecorrespondingvaluesareonly8forZnOnanofiberfilmsSensingfilms◦◦at300Cand17forZnO–In2O3–ZnOnanofiberfilmsat210C.Rap

6、idsensingreactionsarealsoobtainedGassensorsastheresponseandrecoverytimesofZnO–InOnanofiberfilmsto100ppmethanolareonlyabout2andChemicalsensors231s,respectively.Thesehighsensingperformancesareexplainedbyreferringtheheterocontactsformedbythedouble-layerstructure.©2012ElsevierB.V.Allrightsreser

7、ved.1.Introductionsurface-to-volumeratios,manytypesofgassensorsbasedon1DnanostructureMOShavebeenfabricated.Withagrowingdemandforenvironmentmonitoring,chemicalBothZnOandIn2O3aretypicalfunctionalMOS,whichhavegassensorsareattractingincreasinginterestduetotheadvan-beenc