最新光功能稀土氟化物纳米粒子的水热合成 - 材料合成化学专题讲座课件PPTppt课件.ppt 29页

'光功能稀土氟化物纳米粒子的水热合成-材料合成化学专题讲座课件PPT Whyshouldwedothis？Howcouldwedothis？AbasichydrothermalsynthesisCore/shellstructureWhatcanthisdoforus？OutlineMicrowave-assistedsynthesisSelf-AssembledNanocrystals TransitionoftheInner-shell3delectronLinearemissionpeakandhighlymonochromaticLonglifetimeoftheexcitedstateionNonlinearopticaleffectsLuminescencecharacteristicsandapplications EffectoftheSyntheticTemperatureandTimeReactioncondition:1.2gNaOH,5mlH2O,7mlC2H5OH,20mlOleicacidRe(NO3)3(0.5M)NaF(1.0M)T(℃)T(h)Figureshape270µl8ml21020nanorods,d≈15-20nm,l≈100-150nm270µl8ml18020nanorods,d≈20nm,l≈500-600nm270µl8ml1808nanocubes,d≈10nmRef:LeyuWangandYadongLi,Chem.Mater.2007,19,727-734 SEMimagesofrare-earthfluoridepreparedhydrothermallyat230℃for12h.Tube-likenanocrystals.ThecompositionsofthemixturewereNaF:Re(NO3)3:oleicacid:NaOH:ethanol:H2O=4.2:1:22.6:17.5:217:556(inmolarratio).Ref:FanZhangandDongyuanZhao,Angew.Chem.Int.Ed.2007,46,7976–7979EffectofNaFcontentandPhvalue Disk-likenanocrystals.TheamountofNaOHreducedtohalfwhiletheotherconditionsremainedthesame.Rodnanocrystals.TheamountofNaFincreasedto1.5times,withtheotherconditionsunchanged. SchematicdiagramoftheproposedprocessfortheformationofarraysofNaYF4nanocrystals.TheformationprocessofNaYF4nanocrystalsRef:FanZhangandDongyuanZhao,Angew.Chem.Int.Ed.2007,46,7976–7979 TEMcharacterizationofNaYF4nanocrystalsdopedwithvariousconcentrationsofGd3+ionsEffectofGd3+dopingonthenanocrystals：Ref:FengWangandXiaogangLiu,Nature,2010,25,1061-1065 Ref:FengWangandXiaogangLiu,Nature,2010,25,1061-1065PhasetransformationinNaReF4structuresbylanthanidedoping.： CharacterizationdatafortimedependentNaYF4nanocrystals.TEMimagesofnanocrystalssynthesizedat290℃reactedfor(A)10min,(B)40min,and(C)70minrespectively.Reactioncondition：Na-TFA,Re-TFA,oleicacid(OA),1-octadecene(ODE).heatedinamicrowavereactorMicrowave-AssistedSynthesisRef:Hai-QiaoWangandThomasNann,ACSNANO,2009,3,3804–3808 TEMimagesofnanocrystalssynthesizedusingprecursorconcentrations(A)2timesofthestandardconcentration,(B)4times,and(C)20times,reactedfor20minat290C.Ref:Hai-QiaoWangandThomasNann,ACSNANO,2009,3,3804–3808Ref:Hai-QiaoWangandThomasNann,CrystEngComm,2010,12,1993–1996 SEMimagesofNaGdF4MCspreparedat180℃for24handpHvaluesof3(a,b),7(c,d),and10(e,f).AllofthesampleswerehydrothermallyobtainedwithCit3-/Gd3+molarratiosof1:1.Reactioncondition:GdCl3,trisodiumcitrate,NaBF4,NaOH,heatedinaautoclave.Self-AssembledMicrocrystalsinHydrothermalSynthesisRef:FeiHeandXingboLi,Inorg.Chem,2011,50,4116–4124 SEMimagesofNaGdF4MCspreparedwithdifferentCit3-/Gd3+molarratios.(a),0(withoutsodiumcitrate),(b)1:1,(c)2:1,(d)4:1,obtainedat180℃for24hwiththepHvaluekeptat7.Self-AssembledMicrocrystalsinHydrothermalSynthesisRef:FeiHeandXingboLi,Inorg.Chem,2011,50,4116–4124 Ref:FeiHeandXingboLi,Inorg.Chem,2011,50,4116–4124Theformationprocessofmicrocrystals GeneralstrategySchematicCoreShellInertcoatingNaYF4:Yb,Er(Tm)NaYF4,SiO2,TiO2ActivecoatingNaGdF4:Yb,Er(Tm)NaGdF4:YbPlasmonicenhancementAgNaYF4:Yb,Er(Tm)SiO2/Y2O3:ErAuMagneticfunctionalizationNaYF4:Yb,Er(Tm)Gd-Si-DTTA-NaGdF4Core/shellstructure Experiment:First,thecoreprecursorsdissolvedinasmallamountofoleicacidand1-octadecenewereinjectedintothereactionvesselcontainingonlythecoordinatingoleicacidligandandnon-coordinatingsolvent1-octadecene.UponformationoftheNaGdF4:Er3+,Yb3+active-coreparticles,theshellprecursorswerealsomechanicallyinjectedintothereactionflask。Ref:FiorenzoVetroneandJohnA.Capobianco,Adv.Funct.Mater,2009,19,2924–2929ActiveCoating (A)SchematicillustrationofsingleNaYF4@Si-DTTAGd3+nanoparticles.(B)DLSdataofNaYF4nanoparticlesbefore(dashedline)andafterSi-DTTA-Gd3+coating(solidline).(C,D)TEMimagesofNaYF4@Si-DTTA-Gd3+nanoparticlesatdifferentmagnification.MagneticFunctionalizationRef:ZhengquanLiandNiagaraMuhammadIdris,Langmuir,2009,25(20),12015–12018 ThesynthesisofNaYF4@Si-DTTA-Gd3+NanoparticlesTri-100,1-hexanolcyclohexaneAqueousammoniaNaYF4(cyclohexane)transparentmicroemulsionsolutionNaYF4@silicaNaYF4@Si-DTTAnanoparticlesNaYF4@Si-DTTA-Gd3+NaYF4@Si-DTTA-Gd3+NPSstirring20minTEOS24hSi-DTTA&TEOS4timesper2hfor48hstirringTris-HClbufferSolutionPH=7.4GdCl312hdispersedinDIwater Ref:FWangandYHan,Nature,2010,463,1061-1065Luminescentimageofa3DstructuregeneratedinthePDMSsamplecomposedof0.1wt%ofNaYF4:Yb/Er/Gd(18/2/5mol%)viacomputer-controllednear-infraredlaserscanning.Three-dimensionaldisplayUp-conversionluminescence 2Eg=2.24eVEg(Si)=1.12eVsiliconreflectorinsulatorDCconverterDown-conversionluminescenceThequantumefficiencycouldbe200%intheory,makingitanewmethodofgreatpotentialinthesolarspectrummodulationandimprovingenergyconversionefficiencyofsiliconsolarcells. Thankyou! 人生公式 积跬步以致千里积怠惰以致深渊 三天打鱼两天晒网成功重在坚持 多一份努力得千份收获 只多了一点怠惰亏空了千份成就'