High quality photonic opaline structure in one night and their optical reflectance英文文献资料

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1、Availableonlineatwww.sciencedirect.comChemicalPhysicsLetters454(2008)318–322www.elsevier.com/locate/cplettHighqualityphotonicopalinestructureinonenightandtheiropticalreflectanceF.Piret1,B.-L.Su*LaboratoryofInorganicMaterialsChemistry(CMI),TheUniversityofNamur(FUNDP),RuedeB

2、ruxelles61,B-5000Namur,BelgiumReceived7January2008;infinalform12February2008Availableonline15February2008AbstractAhighqualitysilicaopalwithlargecrackfreeareaswassynthesizedbyaquickverticalconvectionself-assemblymethodandtheopticalpropertieshavebeenstudiedandconfirmedthehigh

3、qualityoftheseopalinestructures.Thethermogravimetricanalysisofthecalcinationprocessofsilicaspheresrevealedthattheoptimalcalcinationtemperatureofdepositedcolloidalcrystalisaround240°C,slightlyhigherthanthedehydroxylationtemperatureofsilanols.Animprovementinmechanicalstreng

4、thoftheopalinephotoniccrystalstructurewasobtained.Thewholeprocesshasbeenoptimizedsuchthatsynthesisisfeasibleinonlyonenightwithoutanyinter-vention,openingthepossibleproductiononanindustrialscale.Ó2008ElsevierB.V.Allrightsreserved.1.Introductionstructuresofvariouschemicalco

5、mpositionsthatcouldsupplyacompleteelectromagneticbandgap.PhotoniccrystalsarematerialswithperiodicrefractiveTherealisationandtheimprovementoffabricationindexonalengthscaleoftheorderofopticalwavelengthsmethodsintheassemblyofsubmicrometricparticleshave(UV–Vis–IR).Asaresult,e

6、lectromagneticwavesofcertainthusbeenofgreatinterest.Sedimentation[7],spincoatingfrequenciesarenotallowedtopropagatewithinthemate-[8]andfiltration[9]havebeenexplored,buttheverticalrial[1,2].Theperiodicdielectricconstantvariationispos-convectiveself-assemblyprocessanditsderi

7、vativedevicessibleinonedimensionalmultilayerfilm(Bragg’smirror)gavethebestresultsintermsofhomogeneity,reproducibil-aswellasintwoorthreedimensionalstructures.The3Dityandcontrolofthefilmthickness[10].Severalfactorsstructuresareespeciallyinterestinginapplicationsthat(solconcen

8、tration,temperature,meniscuspropertiesandexploitthecompleteconfinementoflight,suchasthecon-solven