智能窗的热致变色VO2薄膜.ppt

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1、ThermochromicVO2thinfilmforsmartwindowY.J.ZhouY.C.ZhouT.Y.ZhouJ.Q.zhenggroup21Tableofcontents1Introduction2Methodsofsynthesis3Problems&SolutionsWinterSummerTooutsideFromoutsideWindow58%Window73%Floor7%Floor3%Roof5%Roof11%Wall15%Ventilation15%Wall7%Ventilation6%Twoquestions！WorkingprincipleVO2u

2、ndergoesreversibletransitionatcriticaltemperatureTc(68℃);below68℃，VO2issemiconductingandrelativelyinfraredtransparent,andaboveTcitismetallicandinfraredreflecting.(NIR:0.78-2.5um)ResistanceofasuspendedVO2nanobeammeasuredinafour-probegeometryasafunctionoftemperature[1][1]JinqianWu,QianGu,Nanolet

3、ter,2006Vol.6,No.10,2313-2317.[2]LitaoKang,†,‡YanfengGao,ACS,Appliedmaterial&interfaces,VOL.1•NO.10•2211–2218•2009OpticaltransmittancespectraofVO2film[2]MethodsofsynthesisSol-gelmethodChemicalvapordepositionDC、RF&magnetronsputteringPluselaserdeposition★★Sol-gelmethodMixingsolution(HCl,N2H4,V2O

4、5)Sol(OnlyVOCl2)GelAddingPVPAdjustpHPrimaryproductSpincoating[5]LitaoKang,YanfengGao,J.Phys.Chem.C,2010,114,1901-1911SecondproductDryingFinalproductAnnealingWithoutPVPPVPMeritsofSol-gelmethodLowcostSol-gelEasyhandlingEasefordopingLargescaleprocessVaporizationandTransportofPrecursorMolecule

5、sintoReactorAdsorptionofPrecursorMoleculestoSurfaceDecompositionofPrecursorMoleculesonSurfaceandIncorporationintoSolidFilmsRecombinationofMolecularByproductsandDesorptionintoGasPhaseChemicalvapordepositionDiffusionofPrecursorMoleculestoSurfaceUniformityRepeativityLargescaleFilmthicknesscontrol

6、GoodsubstrateadhesionCVDProblemsApplications???Q1:HighMIPTtemperature(≈68℃)Q2:Lowvisibletransmittance(<50%)Q3:WeakopticalcontrastintheIRregionQ4:Unfavorablecolor&ImmatureprocessingGodisimpartial,whoendowsakindofmaterialwithoutstandingpropertieswh-ileinturnhardtoprepare.-Y.J.ZhouForusManythanks

7、foryourattention！